stephen

I feel similar mostly. If the new team can successfully and stably move it to the new Canons that is one thing but nowadays, with ML at its current level of capability/compatibility I see it as great for those who are way short on funds but way long on free time, or are just tinkerers in general, but anyone whose priority is actual shooting instead of fiddling/tinkering is much better off just grabbing a used GH5, S5, S1 etc for well under $1K and getting to it.

@Noli - IMHO the other 2 buttons are none functional. I don't feel or hear any click. Original functionality of previous versions of this EVF was related to industrial instruments/devices. It was meant to be put on a protective helmet. Video input was AV. This previous version industrial EVF was fit with higher resolution sensor, HDMI input and adapted to another application - camera EVF.
After your posting decided to test the EVF with other cameras. Borrowed a Sony A7CR from a friend. With this camera EVF had the same or similar problem to what you describe. Interestingly when I switch HDMI output on Sony A7CR to 1080i interlaced, there is no flickering or garbage but of course split on 2 and can see only the upper half portion.
If I choose auto or 1080p - then initially picture in EVF is some flickering garbage. I have found that have to wait certain time, quite long - 5 to 7 min. After this when I switch EVF off / on picture becomes good and clear. It works as it suppose to work. If I a switch briefly camera off / then on again it still works. But if camera is switched off for longer is stops working and have to wait again.
I used also external monitor with HDMI out. Camera is plugged in HDMI IN of the monitor and EVF in HDMI OUT of the monitor. It works without a problem.
IMHO your conclusion that problem is related to power delivery from camera trough HDMI to EVF is correct. It is strange than after some time , EVF or Camera worms up and it works on certain cameras. Curious to see if HDMI cable with additional USB power delivery will solve problem. It won't be the best solution but at least it will work reliably. 
Have to warn everybody who wants to get this EVF that it doesn't work with all cameras. Guess I was lucky as it works without those problems on Sony ZV-E1.

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Few additional findings and notes:
Tested it in bright sunlight conditions. It is great. Fully isolates the eye. Because it perfectly isolates the eye from external light, once brightness is adjusted there is no need to change it. Optics actually are better than thought initially. It has several lenses not just one loupe. Most likely metal housing was designed and used for smaller sensors - 0.5''. Current one is bigger at 0.7'' that's why far end corners aren't perfectly visible. I saw this only when was feeding it with signal from my laptop. When shooting with Sony ZV-E1 as already mentioned it displays a 3:2 crop at 1620x1080px and everything is perfectly visible and in focus. one relatively simple modification would be to cut the current cable and solder a female HDMI and probably glue it to the side of the EVF. This would allow to use better or custom HDMI cables. size is just perfect for cameras like Sony ZV-E1 and all other mirrorless cameras, especially when you don't want to use a rig and have just the camera and a lens, probably also a cage as it is in my case. Nice experience. Makes shooting with an EVF really comfortable. The more I use it, the more I like it  😀

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Have the older Xiaomi 13 Ultra for almost 2 years. Same sensors and lenses except 75mm telephoto one is 62mm in reality.  My idea was to use it as a pocket video / cinema camera that is all the time with me. And also as my main and only camera on some trips where I don't want to bring additional photo / video equipment.
Still use it from time to time but not as much as thought would be using it. It has many limitations that make getting good footage difficult and ruin as a whole the joy to shoot.
Maybe as a photo camera it would be better
The good:
    Picture and video quality from main sensor is really good. Can be treated as BM BRAW video in Resolve. Can easily color grade it and get great results. Really impressive picture quality from a smartphone and tiny camera that is always in my pocket     Main 1 inch sensor (23mm) lens is good in low light     All 4 sensors/lenses are capable of shooting RAW video at 4K 24fps, 30fps and 60fps     As you said, those smartphones have standard case that makes attaching ND filters really easy. I use 67mm magnetic ND filters and they work like a charm. The not so good or the shortcomings and limitations
    Lens optical IS should be working in MotionCam but in practice I can't get stable handled footage by just using the phone with a simple plastic case for the filters. Gimbal or special metal case with  two handles are needed which totally kills the idea of pocket cinema camera for me. This was not the case with iPhone which I could use and get stable handheld footage by simply holding it and even when walking with no additional support.     Main sensor is good in low light but the other (three) 1/2'' inch sensors are not.     Multiple dot like flares when shooting at night. This is common problem with all smartphones including iPhone. Because of the lenses being so small at night when there are multiple light sources on some occasions you can get multiple small bright dots dancing in your frame. It can completely ruin the footage.     Limited lens focal lengths. My preferred focal length for video are 35mm and 50mm. Xiaomi best sensor is on the 23mm lens. MotionCam can't crop the sensor. It can't even properly frame to 35mm or any given focal length other than native one. Can zoom in the screen which is also the viewfinder but there is no indicators to which focal length it corresponds. Video still will be shot at 23mm and I have to crop in post to get 35mm or 28mm eqv. focal length field of view     Bad ergonomics.  Yes I can get the shots but there is no joy in the process.     While picture quality is impressive for a smartphone it can't match a Full Frame sensor or even APS-C sensor. As you said it can't bend the law of physics     I need to look from time to time trough a viewfinder. Old habit and addiction that I can't overcome. 🙂 Bottom line: I still prefer a hybrid camera and a lens and I don't use much Xiaomi 13 Ultra as camera.
Watched a video about street photography where the author argued that having a tilting screen and shooting from waist  level is the best if we want to take stealth photos where people don't stare at the camera. We can even keep interacting and talking with the people while shooting. This would be impossible with a smartphone.
Anyway this is my experience, hope it will work better for you.

As expected Lumix S1 II uses the same sensor as Nikon Z6 III. Panasonic apparently managed to improve on Nikon Z6 III Achilles heel - 1 stop of lower dynamic range in ISOs under 800. Lumix S1 II has DR above 12 stops at the expense of slightly slower rolling shutter. That's a good decision and achievement. We can always go to APS-C mode and have really fast 6ms rolling shutter. Price in Europe is 3500 Euro as rumors suggested. I think this is a good strategy from Panasonic. Sell to the more impatient at higher price, then as time passes prices will go down. Nikon Z6 III started at more than 2600 Euro, now can be purchased brand new for 2000 Euro. Lumix S1 II is a true hybrid but more on the video side.

Panasonic older bodies are good value. New bodies are not.
S1R II sells for exactly the same price as Nikon Z8 which has faster and fully stacked sensor.
If rumors are true S1 IIE with same sensor as S5 II will be 2800 Euro. Same sensor with very similar specs in the form of Nikon Z5 II sells for 1700 Euro. S1 II supposedly will have the same semi stacked 24Mpx sensor as Nikon Z6 III and will cost  3500 Euro. Nikon Z6 III current price at a local shop is 2000 Euro. I don't think Panasonic will be able to keep these prices. Andrew is right, don't see how new cameras from Panasonic can attract or entice Nikon and Sony users to switch. Maybe with some unique features like open gate or anamorphic ? For me Nikon becomes more tempting not only  because prices are significantly lower for the same sensor and similar specs but because NRaw can be edited directly in Resolve, while ProRes RAW can't. Avoiding transcoding is  a significant time saver for me if I want to shoot  RAW internally.
There are no bad cameras and it's good Lumix cameras have their fans and users.

Few additional findings and notes:
Tested it in bright sunlight conditions. It is great. Fully isolates the eye. Because it perfectly isolates the eye from external light, once brightness is adjusted there is no need to change it. Optics actually are better than thought initially. It has several lenses not just one loupe. Most likely metal housing was designed and used for smaller sensors - 0.5''. Current one is bigger at 0.7'' that's why far end corners aren't perfectly visible. I saw this only when was feeding it with signal from my laptop. When shooting with Sony ZV-E1 as already mentioned it displays a 3:2 crop at 1620x1080px and everything is perfectly visible and in focus. one relatively simple modification would be to cut the current cable and solder a female HDMI and probably glue it to the side of the EVF. This would allow to use better or custom HDMI cables. size is just perfect for cameras like Sony ZV-E1 and all other mirrorless cameras, especially when you don't want to use a rig and have just the camera and a lens, probably also a cage as it is in my case. Nice experience. Makes shooting with an EVF really comfortable. The more I use it, the more I like it  😀

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Few additional findings and notes:
Tested it in bright sunlight conditions. It is great. Fully isolates the eye. Because it perfectly isolates the eye from external light, once brightness is adjusted there is no need to change it. Optics actually are better than thought initially. It has several lenses not just one loupe. Most likely metal housing was designed and used for smaller sensors - 0.5''. Current one is bigger at 0.7'' that's why far end corners aren't perfectly visible. I saw this only when was feeding it with signal from my laptop. When shooting with Sony ZV-E1 as already mentioned it displays a 3:2 crop at 1620x1080px and everything is perfectly visible and in focus. one relatively simple modification would be to cut the current cable and solder a female HDMI and probably glue it to the side of the EVF. This would allow to use better or custom HDMI cables. size is just perfect for cameras like Sony ZV-E1 and all other mirrorless cameras, especially when you don't want to use a rig and have just the camera and a lens, probably also a cage as it is in my case. Nice experience. Makes shooting with an EVF really comfortable. The more I use it, the more I like it  😀

Few additional findings and notes:
Tested it in bright sunlight conditions. It is great. Fully isolates the eye. Because it perfectly isolates the eye from external light, once brightness is adjusted there is no need to change it. Optics actually are better than thought initially. It has several lenses not just one loupe. Most likely metal housing was designed and used for smaller sensors - 0.5''. Current one is bigger at 0.7'' that's why far end corners aren't perfectly visible. I saw this only when was feeding it with signal from my laptop. When shooting with Sony ZV-E1 as already mentioned it displays a 3:2 crop at 1620x1080px and everything is perfectly visible and in focus. one relatively simple modification would be to cut the current cable and solder a female HDMI and probably glue it to the side of the EVF. This would allow to use better or custom HDMI cables. size is just perfect for cameras like Sony ZV-E1 and all other mirrorless cameras, especially when you don't want to use a rig and have just the camera and a lens, probably also a cage as it is in my case. Nice experience. Makes shooting with an EVF really comfortable. The more I use it, the more I like it  😀

Short answer: no. Whole mounting part can be changed but it will require skills and experience to create and make a new one

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Recently saw a second hand Sony ZV-E1 on a local online market place. Price was good and I bought it. Great video camera but lacks EVF. Same is true for it's pro oriented brother FX3.
Typically those type of cameras are used with external monitor on professional shoots or with camera LCD display only when vlogging. If you like EVFs and want to add one,  choice is not great. No external add-on EVF from Sony like the one Sigma FP has. Portkeys LEYE III modified with better loupe is the cheapest one at 450-500 E/$ but I wouldn't call it small. Then Kinefinity EVF for 1250 E/$. Great one but definitely not affordable. There is an obvious gap and need for a relatively small, high quality, affordable external EVFs for cinema / hybrid cameras.
I was looking for quite some time on AliExpress for Mini OLED displays (0.39'' to 0.7'') as a building blocks for DIY External EVF. Usually they come with controller board with HDMI input too. Almost bought some components preparing to do some 3D design and printing around them. Surprisingly found an EVF ready to be used. This type of EVFs were designed to be used with industrial instruments and were on AliExpress for quite some time. They all had lower resolution and AV video inputs in the past. For the first time saw one with 1920x1080 resolution on a 0.7'' mini OLED display and HDMI input. Also for the first time this type of EVFs is targeted toward cameras. Price was good too at 230E/$ so I decided to give it a try.
Received the EVF few days ago and am happy to report that it is better than expected. Here is the list of things that I like and few that I don't like:
What I Like:
High resolution 1920x1080 ( equivalent to 6 220 800 dot camera EVF).  Cameras EVFs have 4:3 ratio to cover 3:2 frame + some black strips on top and bottom to display information like exposure and other camera settings. The sensor on this one has 16:9 aspect ratio. To get 3:2 ratio the EVF crops the image to 1620x1080. Still great resolution at the level of ~5 mln dots EVFs like the one in Panasonic S1 series. I see in the EVF exactly what I see on the LCD screen of Sony ZV-E1 minus peaking. This is a rather good thing. Solid, all metal outer shell, good, even great quality of craftsmanship. Eye cup is big, made from rubber and fits around the eye much better than traditional camera EVFs. Big and bright screen - has at least 10 levels of brightness that can be changed and controlled manually. Picture inside looks big and bright, quite easy to see. Smooth focusing / diopter correction ring. HDMI cable is integrated, ready to be plugged into a camera. HDMI cable looks to have good quality. No need of additional power or battery. It gets small amount of power (500mA) from HDMI. This is a huge plus for me. Has mounting thread, can easily be mounted on rigs or cages or even on camera hot shoe. Can be tilted  and placed in any position you want. Another huge plus. I've simply put it on monitor holder for hot shoe, which is mounted on the camera cage. EVF sits higher and is slightly tilted. It also provides 3rd point of contact and add stability. I am able to hold the camera lower and closer to the chest, which makes it more stable when shooting.  Optimal size for me ! Not too small and not too big. Relatively light. Another huge plus. Optics made of glass, look high quality. Great price for what it offers - 200 Euro ($) including shipping and taxes after some Aliexpress discount. Because EVF receives its power from HDMI you don't have to switch it on separately. It has its own ON/OFF switch but if you stop the camera, EVF stops too as it doesn't receive power from HDMI. This is very convenient because it semi integrates with the camera, you don't have to switch it on/off separately.
What could be better:
While loupe (optics) craftsmanship is high quality, optical schema is probably not the best. Seeing tower end of the frame and in the corners is kind of difficult. In photo mode EVF has to show picture with 3:2 ratio. It crops the display at 1620x1080 to achieve this ratio. Same is true for video. This is great because this way corners of the OLED display are always cropped and dark while picture in the EVF is still high quality and resolution is still great too. So you always look at a picture which is in focus from end to end and you can see the whole of it. Brightness control  has many steps but goes only in one direction. Adjusting it when you want to make picture darker or go at the opposite direction is difficult. You have to cycle trough all settings value until arriving before the setting you were a moment ago. Brightness control button is too small and uncomfortable to use. Both are not huge issues because eye cup completely isolates your eye and cuts external light at almost 100%. Once you set the brightness level you rarely need to adjust it. It doesn't have the additional tools a pro external viewfinder usually has - like peaking, False color, zebras, etc. Because it takes power from camera and becomes additional consumer, battery is drained a little faster. Hard to say how much faster. I still prefer this compared to EVF that have their own battery. Picture is not as clear as in a high quality camera viewfinder. Native camera EVF receives video stream that already has noise reduced. Image on HDMI out from the camera is more like RAW video, lots of noise in the shadows at high ISO, some noise even at lower ISO. I guess the same would be with any external EVF, even expensive PRO ones. It's not EVF's fault. I also see sometimes some texture like noise, not sure because of this particular OLED display or because of the HDMI out stream. Overall picture quality is not up to what you see in a camera integrated EVF but it is close. Surprisingly noise in the shadows helps me better judge exposure and use successfully ETTR. I live in a PAL region but camera was set to NTSC to have 24fps. There was a lot of flicker in EVF image even when only natural (sun) light was available. Maybe this can be avoided with some additional camera settings. No such problem when camera is set to PAL and 25fps. Sometimes when adjusting brightness, EVF looses sync and doesn't display any image. Have to switch camera on/off one time and problem is resolved. Not a big deal but it happened once or twice. HDMI cable is integrated. A PRO EVF has just HDMI out socket and you can choose your own HDMI cable. This one can be easily modified IMHO.   Size: L=~50mm; Diameter ~43mm; weight 188g with the integrated HDMI cable

Overall I like it a lot. There is nothing like it on the market and especially at this price point. I am surprised it took Chinese manufactures so long to figure out that a good market for external EVFs exists. I prefer it over modified Portkey LEYE III because of the smaller size and no need to plug and charge another battery. I may buy another one. 🙂 Now my Sony ZV-E1 has an EVF and a great one too. 🙂 
Here is the link:
On Aliexpress
You can find it on ebay too. Search for V780H EVF
Here how it sits on top of Sony ZV-E1

Have the older Xiaomi 13 Ultra for almost 2 years. Same sensors and lenses except 75mm telephoto one is 62mm in reality.  My idea was to use it as a pocket video / cinema camera that is all the time with me. And also as my main and only camera on some trips where I don't want to bring additional photo / video equipment.
Still use it from time to time but not as much as thought would be using it. It has many limitations that make getting good footage difficult and ruin as a whole the joy to shoot.
Maybe as a photo camera it would be better
The good:
    Picture and video quality from main sensor is really good. Can be treated as BM BRAW video in Resolve. Can easily color grade it and get great results. Really impressive picture quality from a smartphone and tiny camera that is always in my pocket     Main 1 inch sensor (23mm) lens is good in low light     All 4 sensors/lenses are capable of shooting RAW video at 4K 24fps, 30fps and 60fps     As you said, those smartphones have standard case that makes attaching ND filters really easy. I use 67mm magnetic ND filters and they work like a charm. The not so good or the shortcomings and limitations
    Lens optical IS should be working in MotionCam but in practice I can't get stable handled footage by just using the phone with a simple plastic case for the filters. Gimbal or special metal case with  two handles are needed which totally kills the idea of pocket cinema camera for me. This was not the case with iPhone which I could use and get stable handheld footage by simply holding it and even when walking with no additional support.     Main sensor is good in low light but the other (three) 1/2'' inch sensors are not.     Multiple dot like flares when shooting at night. This is common problem with all smartphones including iPhone. Because of the lenses being so small at night when there are multiple light sources on some occasions you can get multiple small bright dots dancing in your frame. It can completely ruin the footage.     Limited lens focal lengths. My preferred focal length for video are 35mm and 50mm. Xiaomi best sensor is on the 23mm lens. MotionCam can't crop the sensor. It can't even properly frame to 35mm or any given focal length other than native one. Can zoom in the screen which is also the viewfinder but there is no indicators to which focal length it corresponds. Video still will be shot at 23mm and I have to crop in post to get 35mm or 28mm eqv. focal length field of view     Bad ergonomics.  Yes I can get the shots but there is no joy in the process.     While picture quality is impressive for a smartphone it can't match a Full Frame sensor or even APS-C sensor. As you said it can't bend the law of physics     I need to look from time to time trough a viewfinder. Old habit and addiction that I can't overcome. 🙂 Bottom line: I still prefer a hybrid camera and a lens and I don't use much Xiaomi 13 Ultra as camera.
Watched a video about street photography where the author argued that having a tilting screen and shooting from waist  level is the best if we want to take stealth photos where people don't stare at the camera. We can even keep interacting and talking with the people while shooting. This would be impossible with a smartphone.
Anyway this is my experience, hope it will work better for you.

All I want to know is if the presentation has finished yet?

You can always use optimizations and make timeline with NR and lots of color grading play in real time. For Example - Top Menu ->Timeline -> Timeline playback resolution -> Half or even Quarter.  In most cases Half or 1080p from 4K would be enough.

Attention economy!
Did you see the Northrup video on the S1R II, with the clickbait title "better than Sony and Canon"...
How the turn tables.
I wouldn't be surprised if he is just using this to bait Sony's PR team into giving him more attention.
*Attention economy*
I agree with you 100%.
Yep, I sold my GH6 for less than £700.
Indeed and although it was $1000 more expensive at launch than the S1R II is today, that Panasonic still does not have an answer to the 2020/21 flagship sensor technology in 2025 should concern us all.
I don't know how much longer they can half-commit resources to this market without leaving it entirely.
And add on top of that the uninspired design department, unimaginative marketing and unintelligent product strategy as a whole and I really do think Lumix is on the way out.
S1R II just reinforces it if anything.
That it came out before the S1H II as well... Means we have to wait even longer for the real hybrid filmmaking camera, which is Pana's biggest strength!!
They ignore their strengths and deliver what nobody wants.
Look at the S9... people were expecting the GH7 launch and they showed them that!!
It's just dumb.
Yeah cloning 5 year old Sony/Canon bodies but with worse AF seems to be the new Lumix strategy.
From pioneers to copy-cats.
I fully agree.
Yes that's another elephant in the room nobody talks about, the S Pro lens range absolutely cannot compete with Canon/Nikon/Sony.
All I can say is that it's a good job Sigma is carrying the whole thing, as left to Panasonic and Leica, L-mount would be seen as so expensive nobody in their right mind other than rich Leica users would go anywhere near it!
The image quality is the least of the S1R II's problems. All looks good.
But then so do 7 or 8 other full frame cameras.

This is just it. As of today, the new LUMIX is ‘the latest thing’ but tomorrow it won’t be. Not necessarily literally tomorrow, but probably within weeks as I believe the Sony A7V is up next and it will inevitably garner more adoration than the Panny.
The influencers lurch like lemmings from one thing to another, but there will be a core of loyalists.
I don’t remain loyal to any brand for loyalty sake but rather because they offer a combination of the best/least compromised tools that do the job I need them to do combined with the financial cost.
It is arguable that the new Panny is not quite ‘flagship worthy’ in terms of build and I agree. It’s pretty good, but IMO, compared with what existed before within the brand and what else is out there, it’s not quite what I expected, but maybe has to be at this level for financial reasons?
Thinking about it further, it’s more like a larger sensor evolution of the S5ii so really it’s an S5iiiR but I guess using S5iii so soon would suggest the S5ii is outdated and it is far from that.
Spec-wise, it’s not far off what I expected. Personally, I would have preferred full-frame 6k 60p open gate. And stopped there. Make that fantastic and willfully ignore 8k even if the sensor can do it. At least with this model.
And then the sensor. I wonder if they could not use the 61mp sensor or whether they could and this was a deliberate choice, but it’s an odd one of so to go from 47mp to 44mp after what, 6/7 years and call that progress.
And yes, I am aware, more pixels is not the be all and end all but personally, for my own photography needs, I did want want more and 44mp is borderline for how I work and want to work. 60 or more is where I want/need to be and I know all the blah blah blah “on social media posts it’s irrelevant” etc but that comment is irrelevant to me because I wish to be able to produce work up to a standard set by myself, not opinion.
So as a value proposition, is it good value? And is the brand dying?
I think brand new, it’s not the best value option out there unless it suits your specific needs and you are already heavily invested in the L Mount system.
I think its value will be used in 6-12+ months time. Especially 12+ months time.
Would I buy one new?
Yes, if I did not already own an A7RV and have all the glass I want for that.
Do I think it’s as good owning S5ii and A7RV?
No.
Is the brand dying?
Probably. A slow but inevitable silent death.
The products are not crap. They are highly competitive and these last few days, the influencers are all over them but the simple reality of business is you have to be relevant 365 days a year, not for 'your week in the sun' once every few years. It is not enough.
L Mount is a niche player.
To be a successful niche player, you have to have something different and stand out for that, not by being ‘good enough’. Because it is not enough.
If there is to be any kind of S1H successor, it will be received as the original was and every subsequent LUMIX camera has been, - news for a few days.
Within L Mount, Leica exist because they play their design, build and heritage card.
Sigma exist because they play their slightly crazy Japanese card.
LUMIX play their slightly dull but worthy card.
And that I think is the root of their issue and will be their undoing.
You can fly out all the influencers you want (and you should), but the product HAS to be more exciting.
Because if it is not, someone else WILL eat your lunch. Breakfast and dinner.

Some of these youtubers use multi fake accounts on forums and L-M43-Sony rumors site to upvote themselves or downvote other people, this also allows them to have an army of virtual minions to support then even when they talk nonsense, like when the Hybridshooter said the IBIS of the A7III/A7IV was as good as on the S5/S5II. 
2 years ago, he mixed up his accounts on L-rumors while responding to a guy, he quickly deleted his post, but sadly for him, someone made a screenshot before he deletes his post.
Most youtubers must really be taken with a big grain of salt, even Gerald Undone who was really hard on Panasonic in the past and concentrated most of his reviews to point out the negative aspects of their cameras and lenses without talking too long about their positive sides. But for people using both Panasonic and Sony cameras , its bias was clear.
However I must admit I'm a bit disappointed by Panasonic products since 2022.
I use their cameras since a long time, I loved the GH4 and GH5 and I liked the S1, but everything after looked much less refined. The GH4 and GH5 had groundbreaking features and like the NX1, these cameras were ahead of their time.
The GH6, althouht it had great color science, was a total failure. In Europe, the price was cut down by almost an half after only some months ...
At this time they also changed their video engine making fine details in 4k looking like an oversampled 1080p, the S5II's 4k almost looked like smartphone footage, especially when using the 709 profiles and when the image was slightly underexposed leading to a waxy look when shoothing people face. I had absolutely not the feeling to use a Panasonic camera, this camera was really pointed toward influencers and smartphone users. So yes they have good IBIS and they have Open Gate, but still ... 
To come back about the S1RII, even if Panasonic fanboys are angry and even if they do the most they can to prove that everything is great and most flaws are not so important, the truth is this S1RII is the replacement of a 6 years old camera, and after 6 years Panasonic can't even reach the spec of the R5 from 2020 ? This is not serious, the R5 has much better rolling shutter, 8k internal raw without crop, and yet it is a camera from 2020 !
What we will get with the hypothetic S1HII ? During 6 years Panasonic used and re-used the same A7III sensor from 2018, so maybe we will just get a clone of the A7SIII ? I'm barely kidding.
Now you can find the R5 for less money than the S1RII (in Europe the price of the S1RII is close to 3600€), and if you want something better, of course in spending more money, you can get the great Nikon Z8, even the cheaper Z6III looks sometimes most interesting than the new Panasonic camera. And what about the lenses, why Panasonic stopped to make new S Pro lenses since 2019 ? We only have one S Pro prime. I don't see the point to invest to the L-mount for most people at this point and the S1RII will not help.
Since 2019, the wait to get a flagship camera was really too long, especially to get a camera "almost" as good cameras from 2020/2021.
I'm afraid it will be a total failure like the GH6 and there is a big chance the camera will be much cheaper in some months. I hope I'm wrong. 
On the positive side (according to some reviews), the crunchy/smartphone looks of the S5II is not present in the S1RII, as well as the waxy skin texture.
Like someone said earlier, it still can be a good upgrade from the S1 for people who are already heavily invested in the L-mount system.
 

If we look at S1R II as a photo camera with some advanced video features, then yes it is good. I would choose it over Sony A7R V. As a hybrid camera that can do both video and photo well it is not at Nikon Z8 and Canon R5 II level as those two have lower rolling shutter. Nikon Z8 price is the same, Canon R5 II is more expensive.
S1R II rolling shutter at 6K and 4K 24p/30p is 23ms. Compared to S5 II (21ms) it is basically the same. Not interested in 8K. I am disappointed because was expecting similar to latest Canon and Nikon rolling shutter performance, sensor with faster readout times and improvement over the previous generation. Being also more at the video side I am not sure that 4K 60p and 120P are enough for upgrade. Maybe later when price goes down. I am beginning to realize that at this point in time only Canon and Sony as sensor producers are safe bet in the long run.
Gerald Undone mentioned that Panasonic should consider giving as an option a line skipped version for 6K and 4K 24p/30p in order to improve rolling shutter performance. Line skipped 6K on a 4K timeline may look good. 4K 120p already does the like skipping apparently.
We don't know what are the reasons for Panasonic to choose this sensor. I've heard before that Panasonic may not have access to all sensors Sony semiconductors produces. S1R II has a lot of nice features lets hope sales will be good.
There is a more positive balanced review from Media Division. On at least one 8K and mostly static shots I already can see rolling shutter effect.
https://www.youtube.com/watch?v=v4_oyevhTc8
 

If we look at S1R II as a photo camera with some advanced video features, then yes it is good. I would choose it over Sony A7R V. As a hybrid camera that can do both video and photo well it is not at Nikon Z8 and Canon R5 II level as those two have lower rolling shutter. Nikon Z8 price is the same, Canon R5 II is more expensive.
S1R II rolling shutter at 6K and 4K 24p/30p is 23ms. Compared to S5 II (21ms) it is basically the same. Not interested in 8K. I am disappointed because was expecting similar to latest Canon and Nikon rolling shutter performance, sensor with faster readout times and improvement over the previous generation. Being also more at the video side I am not sure that 4K 60p and 120P are enough for upgrade. Maybe later when price goes down. I am beginning to realize that at this point in time only Canon and Sony as sensor producers are safe bet in the long run.
Gerald Undone mentioned that Panasonic should consider giving as an option a line skipped version for 6K and 4K 24p/30p in order to improve rolling shutter performance. Line skipped 6K on a 4K timeline may look good. 4K 120p already does the like skipping apparently.
We don't know what are the reasons for Panasonic to choose this sensor. I've heard before that Panasonic may not have access to all sensors Sony semiconductors produces. S1R II has a lot of nice features lets hope sales will be good.
There is a more positive balanced review from Media Division. On at least one 8K and mostly static shots I already can see rolling shutter effect.
https://www.youtube.com/watch?v=v4_oyevhTc8