Stab

Autofocus for video will never work for 100% of the situations. It's that simple in my opinion. And since it won't, it's better to become the master of manual focus so you will never ever have the problem of becoming dependable on autofocus, until you find yourself in a situation where it doesn't work.
For instance, you're filming a wedding. You have a beautiful shot on the bride and all of a sudden her father walks in the room. You quickly zoom out to get him or them both in the frame. You want to focus on him but still keep the frame like an over-the-shoulder. How does the autofocus know what to focus on here? It doesn't know, so you have to tell it.
So do you physically have to touch the touchscreen here or press some buttons to transfer the focus from one point to another? On any camera without voice-command, most likely.
And are you able to do so without moving or shaking the camera and maintaining the exact frame? Not with my setup.
I can however with my middle finger just slightly move the focus ring of my lens whilst holding my rig steady, and the focus peaking confirms my new focus point. 0.02 seconds of work with great results.
I do not need to discuss autofocus for video ever nor while I ever rely on it for the things that I do such as weddings. 'Sorry that I messed up your ceremony, the autofocus didn't work apparently'. No.
On a professional movie set with expensive props, gear and talent? Nope. 
As a vlogger or to hold your cat in focus while it moves towards you? Yep, might be handy. Surely there are and will be camera's who will be up to this task but so is my $150 phone.
So yea, I agree with you. No perfectionist, which every cameraman or cinematographer should be, would actually care about autofocus.

Autofocus for video will never work for 100% of the situations. It's that simple in my opinion. And since it won't, it's better to become the master of manual focus so you will never ever have the problem of becoming dependable on autofocus, until you find yourself in a situation where it doesn't work.
For instance, you're filming a wedding. You have a beautiful shot on the bride and all of a sudden her father walks in the room. You quickly zoom out to get him or them both in the frame. You want to focus on him but still keep the frame like an over-the-shoulder. How does the autofocus know what to focus on here? It doesn't know, so you have to tell it.
So do you physically have to touch the touchscreen here or press some buttons to transfer the focus from one point to another? On any camera without voice-command, most likely.
And are you able to do so without moving or shaking the camera and maintaining the exact frame? Not with my setup.
I can however with my middle finger just slightly move the focus ring of my lens whilst holding my rig steady, and the focus peaking confirms my new focus point. 0.02 seconds of work with great results.
I do not need to discuss autofocus for video ever nor while I ever rely on it for the things that I do such as weddings. 'Sorry that I messed up your ceremony, the autofocus didn't work apparently'. No.
On a professional movie set with expensive props, gear and talent? Nope. 
As a vlogger or to hold your cat in focus while it moves towards you? Yep, might be handy. Surely there are and will be camera's who will be up to this task but so is my $150 phone.
So yea, I agree with you. No perfectionist, which every cameraman or cinematographer should be, would actually care about autofocus.

Autofocus for video will never work for 100% of the situations. It's that simple in my opinion. And since it won't, it's better to become the master of manual focus so you will never ever have the problem of becoming dependable on autofocus, until you find yourself in a situation where it doesn't work.
For instance, you're filming a wedding. You have a beautiful shot on the bride and all of a sudden her father walks in the room. You quickly zoom out to get him or them both in the frame. You want to focus on him but still keep the frame like an over-the-shoulder. How does the autofocus know what to focus on here? It doesn't know, so you have to tell it.
So do you physically have to touch the touchscreen here or press some buttons to transfer the focus from one point to another? On any camera without voice-command, most likely.
And are you able to do so without moving or shaking the camera and maintaining the exact frame? Not with my setup.
I can however with my middle finger just slightly move the focus ring of my lens whilst holding my rig steady, and the focus peaking confirms my new focus point. 0.02 seconds of work with great results.
I do not need to discuss autofocus for video ever nor while I ever rely on it for the things that I do such as weddings. 'Sorry that I messed up your ceremony, the autofocus didn't work apparently'. No.
On a professional movie set with expensive props, gear and talent? Nope. 
As a vlogger or to hold your cat in focus while it moves towards you? Yep, might be handy. Surely there are and will be camera's who will be up to this task but so is my $150 phone.
So yea, I agree with you. No perfectionist, which every cameraman or cinematographer should be, would actually care about autofocus.

Get the 32GB (I've seen PP CC use well over 16GB (not GH5 specific)). Looks like AMD doesn't support Quad Channel, though 4 8GB sticks are usually cheaper that 2 16GB (only a minor performance difference on Intel boards).

Let me start with this:
~ 2-4 hours  
4K --> 1080p in premiere is nicely multithreaded up to 4 cores (here & here). After that nothing. Transcoding to 4K is up to 8 cores. 
Also premiere does not use the GPU for transcoding, whereas Resolve does (here), so it might be a solution for you.
It will but don't get me wrong, if you need to edit 2-4 hour footage in a day, then any advantage that an upgrade will give you (which it will) might be worth it. 
Have a look at all the articles about Premiere performance over at Puget systems you will get a very good feel of the hardware you need. 

I've tried Sony Vegas, Premiere/Premiere CC, Pinnacle Studios, some "free" video editing softwares and all of those have lag or stutter issues with the live playback EXCEPT PowerDirector. PD was the only software that edited 100% lag and stutter free with my hardware for my GH4's 4K files. 
My Specs: i7-3820 @ 3.6mhz, 16gb DDR3 1600mhz Ram, 1070 SC 8gb, 120gb Corsair Nuetron GTX SSD
But the weird this is, all the software lags with ANY resolution video I used, even 144p stutters and lags with all the settings configured to try and help video playback / smoothness. I have a feel something NVIDIA Control Panel is overwriting a setting cause the lag in most of these software. I'm just glad PowerDirector works amazing, but lacks some features Premiere has. So it maybe your software rather than hardware you may need to change?

Hi Timoteo,
I have the GH5 and the Speed Booster XL and have used several different lenses with this setup. The GH5 has not seen so much action yet, but that's because it's just in my posession. 
I have however shot with the GH3 for 4 years and during the first year I have used  Samyang / Rokinon (same lenses, different name) extensively. I've owned the 16mm f2.0 /35mm f1.4 / 85mm f1.4. Mind you, I had the 'photo' versions, not the cine versions.
Here is a short film I did with those lenses. I was very happy with them and I still have the 85mm f1.4. It's golden for video and I like the long focus throws of the lenses and how they look and feel. I think the only difference between the photo and cine versions is the housing and the focus and aperture rings. You can't go wrong with either I think.

The only reason for selling the 16mm and the 35mm is because I mainly shoot weddings now, and I needed a zoom lens for that which became the Sigma 18-35 f1.8. I still use the 85mm often and it's teriffic!
https://vimeo.com/79220862
 

Thanks Stab,
I enjoyed watching your short film. Beautiful.
 

Hi Timoteo,
I have the GH5 and the Speed Booster XL and have used several different lenses with this setup. The GH5 has not seen so much action yet, but that's because it's just in my posession. 
I have however shot with the GH3 for 4 years and during the first year I have used  Samyang / Rokinon (same lenses, different name) extensively. I've owned the 16mm f2.0 /35mm f1.4 / 85mm f1.4. Mind you, I had the 'photo' versions, not the cine versions.
Here is a short film I did with those lenses. I was very happy with them and I still have the 85mm f1.4. It's golden for video and I like the long focus throws of the lenses and how they look and feel. I think the only difference between the photo and cine versions is the housing and the focus and aperture rings. You can't go wrong with either I think.

The only reason for selling the 16mm and the 35mm is because I mainly shoot weddings now, and I needed a zoom lens for that which became the Sigma 18-35 f1.8. I still use the 85mm often and it's teriffic!
https://vimeo.com/79220862
 

Stab math, best math.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Funny to see a 100 pages discussion from which is 80% about Autofocus. At the same time, hundreds of video's are posted but none of them contain any production value. 90% is just baby- / cat- / house- / foreground flowers in focus / neighberhood video's.
Also telling is that nowadays many vloggers buying a GH5 for their work. It's funny and weird to see how the video market has changed from a majority of professional camera users, to 90% hobbyists, vloggers and rich people buying this cam to play with for a while before never touching it again.
Sorry, but i can't help the feeling of feeling slightly bad for all these spoiled little brats. If you can't or won't produce anything of visual value with this camera, then please don't judge it for it's AF capabilities. I have never used AF for video nor while I ever, and I'm not saying nobody may not or shouldn't, I am just pointing out what a bunch of whiners film makers have become.
We used to use gear which was highly impractical and inefficient and made the best out of it to satisfy our clients. Now we're shooting 4k in slow motion footage of our cat which moves away from us all the time or towards us, and complain that this stupid 2000 euro camera can't even hold the damn cat in focus.
This is not a complaint about EOSHD, where the percentage of sensible professionals is still pretty high, but about all the stuff I've seen lately on Youtube, Facebook and forums about this AF-talk combined with their cat- and garden video's.
As soon as I will finish some professional shoots with the GH5, I will report back here. Until then, I'm gonna leave the discussions up to you. Happy shooting.

Premiere CC 2017. With CUDA-support enabled so the GPU does lots of work in both real time and exporting.

Looks great Jonpais!
I just did some more editing tests on my laptop. I'm surprised that even my laptop handles the 4k 50p/8-bit footage fine!
It has a mere i7 4700HQ and an Nvidia 760m (which gets a lot of work to do when applying effects but that's to be expected), but i can just work directly on the files and having smooth playback in both the source monitor and the preview monitor.
I'm positively surprised because lots of people 'scared me' with their recommendation to transcode the footage first before editing because otherwise our computers will not handle the footage. 
Now, I have only one question. Does it get more taxing on the computer if the timeline gets longer? In other words, is a 10 minute film more stressful on the CPU and GPU than a 2 minute clip? Because I have just tested a timeline of 2 minutes.
So far, looks like I will not have to transcode anything.
How about you guys?

I've just did some more testing and came to the following conclusions:
(I shot all clips in 4k 50fps 8-bit 150mbps and a couple in 25 fps with the VFR on)
- IBIS is working very well at 35mm, pretty good at 24mm and horrible / unusable at 18mm. This is with a 18-35mm on a Speed Booster XL.
- The VFR mode on 1080p is a bit soft after looking at 4K clips for a while, but the worst thing is the horrible moiré and aliassing. Even small waves on water do it. Plants and grass in the background induces it also. The only way to shoot in this mode is filming people with the background out of focus in my opinion. Still a nice trick to use once in a while.
- Battery life of the camera is heavily decreased compared to GH3 / GH4.
- CineLike-D has more shadow-detail ánd highlight detail than any other profile except for V-LOG. It does however take away some color tonality. I like the colors of Natural the best, but I prefer the extra DR of Cinelike-D. So I'm going to stick with the latter.
- This camera overexposes pretty quickly, but when shooting 1-2 stops underexposed, the image grades very nicely and there is a lot of detail in the shadows that can be brought back. So, similar to other GHx camera's actually.

Last but not least, I've made an edit of some test footage and my computer is able to handle it all and provides playback in realtime and full resolution! I honestly didn't expect this as my specs aren't that great in 2017. 
CPU: I7 3770 / 12 GB mem / GPU: Nvidia GTX 1060 6GB / Premiere CC 2017.
The montage was just 1:30 long but I added some effects (Warp Stabilizer, Filmconvert) and did some cuts and fade-ins. Sometimes it slightly hesitates but when I press spacebar again it's smooth as butter. Not having to transcode the footage is very convenient and I hope the playback will stay smooth on longer projects with more clips and effects.
Does anyone else have similar experiences?

Daniel Peters fixes the live view problem during HFR. Use shutter speed, not shutter angle. 
 
Great summary! I think you hit the points I'm seeing exactly!! (Indeed, almost a word for word conversation I just had with a friend here) Especially the ones I've put in bold. I tried the gx85 ibis on my 7.5 rokinon fisheye and it spewed over it. So a bit hit and miss with the non-pana wide lenses. Something to be wary of. 
Nice video   Just to clarify, if you look at what you're quoting, he is not talking about IBIS. That comment is about the additional electronic stabilisation which has a crop. 

I've just did some more testing and came to the following conclusions:
(I shot all clips in 4k 50fps 8-bit 150mbps and a couple in 25 fps with the VFR on)
- IBIS is working very well at 35mm, pretty good at 24mm and horrible / unusable at 18mm. This is with a 18-35mm on a Speed Booster XL.
- The VFR mode on 1080p is a bit soft after looking at 4K clips for a while, but the worst thing is the horrible moiré and aliassing. Even small waves on water do it. Plants and grass in the background induces it also. The only way to shoot in this mode is filming people with the background out of focus in my opinion. Still a nice trick to use once in a while.
- Battery life of the camera is heavily decreased compared to GH3 / GH4.
- CineLike-D has more shadow-detail ánd highlight detail than any other profile except for V-LOG. It does however take away some color tonality. I like the colors of Natural the best, but I prefer the extra DR of Cinelike-D. So I'm going to stick with the latter.
- This camera overexposes pretty quickly, but when shooting 1-2 stops underexposed, the image grades very nicely and there is a lot of detail in the shadows that can be brought back. So, similar to other GHx camera's actually.

Last but not least, I've made an edit of some test footage and my computer is able to handle it all and provides playback in realtime and full resolution! I honestly didn't expect this as my specs aren't that great in 2017. 
CPU: I7 3770 / 12 GB mem / GPU: Nvidia GTX 1060 6GB / Premiere CC 2017.
The montage was just 1:30 long but I added some effects (Warp Stabilizer, Filmconvert) and did some cuts and fade-ins. Sometimes it slightly hesitates but when I press spacebar again it's smooth as butter. Not having to transcode the footage is very convenient and I hope the playback will stay smooth on longer projects with more clips and effects.
Does anyone else have similar experiences?

I've tried walking with it and it was warping all over the place. Much like Warp Stabilizer. And since it crops the image also, I would just stick to Warp Stabilizer if necesarry.
From my first tests, the IBIS of the GH5 (at least with non-native lenses like I use) is not suitable for heavy motions or stuff like walking. It is however very capable of reducing shake and jitter and that always comes in handy.

UPDATE:
I received the Seetec F7. Let me post my findings here as I promised.
It's fucking awesome. Paired it to the GH5 today. Colors are 99% the same as what I see on the camera's own display. 7 inch is a perfect size for me as I like to be inspired with what I'm shooting. It's tack sharp and viewing angles are great.
There is a slight delay which shouldn't be more than 0.3 secs. I am used to it, my other monitor had it also, but it is there. Might put some people off.
For the rest I see no downsides. It has peaking, a zoom in function, and takes Sony NP-F970 batteries. I don't know how those will last yet. I expect at least half a day.
Hard to beat for the price I think. As it came in a brandless box, I'm pretty sure these are 100% the same monitors as the Feelworld monitors and most like also the same as the Cinemartins. 
Happy shooting!

You press the 'up' button on the controller / joystick.

It's also a bit of misunderstanding that the edges will be easier to tame on a wider lens while moving.   It's the opposite.  It's true that a wider lens will tame microvibrations and shake better than a longer lens when looking at the overall frame and especially the center of the frame, but wide lenses are stretching a lot more information into the sides, so they exaggerate any movement and certainly any anomalies at the edges.  Even with a totally steady setup, try walking with an ultra wide lens or a fisheye.  The edges will look awful.  Now add to that a bit of shake.
Of course, what everyone else is saying about telling the camera the correct focal length is also important for the IBIS.