Django

The A7SIII/FX3 should really be considered for two things: low-light and rolling shutter. It pretty much sits on top of the pyramid for those two categories. For hybrids I'm more into high resolution sensors so R5/R5C/A7RV/Z8 would be my picks but stacked sensors are even more clutch so Z8/R3/XH2S are also ace choices. I think the next gen of Sony's and Panny's equipped with stacked sensors will be lit. But yeah all current cameras are still pretty great!

Well if you're also on Canon, do check out the R5C. It's imo bit more cine cam oriented with the actual full C-line menu that includes things like shutter angle, gain ISO, WFM, false color etc. It can also do 8K60p FF, 6K S35, 2K S16. And internal RAW. All things the Sony can't do. And it has an EVF! The higher resolution may come in useful if you do macro/crop work. And the various crop modes open up a lot of lens options. It's not perfect, its downsides are poor battery life and no IBIS but there are workarounds. 
In the end I think your lens preference should dictate what system you choose but that's the alternative I'd consider (I'm also on both Sony & Canon systems).

..a GH5+ f0.95 lens combo is not going to get you near the same results as a 10-year old BMD pocket cam with f2 lenses.
I say go use that A7S, you have one of the best low-light cams still to date.. might as well put it to good use!
Coming from a BMD background shouldn't be too difficult. The main thing is there is no shutter angle so you'll have to calculate it using shutter speed. Also yeah the 8-bit codec isn't going to go very far with grade so you may wanna avoid it for low contrast night scenes, not to mention no view assist either. The biggest issue with the OG A7S is it has a very poor AWB, especially in mixed lighting scenes. There is this nasty colour cast that is kinda hard to get out in post with baked-in profiles so yeah testing would be ideal. 

Imagine the reaction if Canon was releasing these cameras. You'd have your Canon apologists, of course, but man, Canon would be getting torn to shreds in Facebook groups, forums, and on YouTube (and rightfully so!). Sony though... not much of a peep from the usual crowd.

..the real problem with these is going to be the severe overheating. A7IV already overheats in a full size Alpha body, these will toast faster than white bread.

..the real problem with these is going to be the severe overheating. A7IV already overheats in a full size Alpha body, these will toast faster than white bread.

..the real problem with these is going to be the severe overheating. A7IV already overheats in a full size Alpha body, these will toast faster than white bread.

..the real problem with these is going to be the severe overheating. A7IV already overheats in a full size Alpha body, these will toast faster than white bread.

..the real problem with these is going to be the severe overheating. A7IV already overheats in a full size Alpha body, these will toast faster than white bread.

Will do that for sure, what I'm doing now is my research so I know exactly what to look for and how to set up the cams when I do get them in-hand. Its also not just about the bodies but of course the lens systems. Nikon Z has great glass but not a lot of them have OIS compared to Canon. Not the same specs/price points either. The Nikon S 35mm f1.8 for example has no IS and costs 1000€ whereas the Canon 35mm f1.8 has IS, macro and costs 500€. That said the Nikon has better optics, and the AF motors are totally silent compared to the noisy Canon. The RF24-70mm f2.8 has IS whereas the Nikon S24-70mm f2.8 doesn't have VR (neither does Sony equivalent). All these things are to be considered when choosing a system so yeah its kind of a long research process..
I shoot mostly 180 degree, except when I don't lol. Canon gyro data is directly processed inside IS lenses and in tandem with IBIS equipped bodies. You can't apply it in post like on Sony's catalyser or latest BMD cams. 
Actually I started out photography on Nikon film DSLRs and had a D750 for a while. I've shot with a Z6. So I'm familiar with Nikon. That being said I never was a fan of their menus, UI, AF system and ergonomics. 
I much much prefer Canon for the above, namely the thumbwheel for aperture control and I love the AF customisation (especially the way you can toggle AF servo on/off in stills and completely pause the video AF via custom button). 
Also the R5C has the ever so great cinema menu with all the video assist, LUT support, video AF modes with Face Only, button customisation etc.
I totally recognise this may be complete personal bias but it has nothing to do with brand affiliation. I've shot on Nikon, Fuji and am currently on Canon, Sony & Leica systems. I'm pretty flexible and each system has its pros&cons. 
What I can tell you is that out of all the bodies I've tried across multiple systems, the R3 is by far my favourite one. The specs are almost perfect too. I was all set on getting it but the R5 shoot I did the other day spoiled me and now I absolutely want a +45MP cam for stills. The R5C gives you that plus an 8K RAW mini C70 in one body, if not for the lack of IBIS it kinda ticks all the boxes. 
Then you got Z8/Z9 with 45MP/8K stacked sensors, IBIS, RAW plus that also records in ProRes 422 HQ which is a blessing in post.
I know I'd be happy and set for years to come with any of these cams but it's a big investment with the lenses so one has to choose very wisely!

You're preaching to the choir: I've been using EF-L glass for over a decade (been on Canon since the 5D mk1) and have been adapting EF to RF since first EOS-R which I bought on day one with the adapter.
So far my only RF investment has been the 35mm f1.8 IS which is cheap, versatile and compact but not optically on par with L glass and super noisy when it comes to AF motors for video use. Actually most RF lenses I've tried including RF-L are noisy.
That being said, the RF 24-70mm f2.8 L paired with the R5 was a total game changer for me. Optically it is next level, especially for a zoom lens (I'm mainly a prime shooter). In fact it flat out beat my trusty EF-L 35mm f1.4 in many departments. Besides the RF lens IS + IBIS gave an awesome 8-stops of stabilisation resulting in tack sharp 45MP pics at low shutter speeds and super stable handheld video footage. That combo is something else.
And that's the beauty of mirrorless, you can use optically perfect modern lenses or go the vintage route depending on budget but also personal preference. If I ended up going the Nikon route, I'd for sure use my vintage Nikkor AI-S glass but would also invest in some native Z-mount lenses for that great silent modern performance and optical quality when needed. 
 
 

Of course testing a camera for yourself is always the ideal thing but it ain't that easy when it comes to the R5C. It's just not the most available camera. Kind of a niche product like the 1DC, but I will certainly try to hunt one down when I get back to Paris..
Not a lot of comp tests either on YT but I did find this R5C vs Z9: Canon R5C vs Nikon Z9 Hands On Camera Comparison
The stab tests are interesting since they're using longer 100mm lenses. Clear advantage to Z9.
In other areas such as DR I was surprised to see the R5C had the edge, and the Z9 had it for AF.
Although not the most scientific tests that video has got me curious about the Z8/Z9 again so I will definitely spend more time on the Nikon before I commit to either R5/R5C!
 

I think best for you is to rent a R5c for a day and try the hell out it.

For me when I do video 9 out of 10 times I pick the R5c as A cam and eventually the R5 as B cam. 

If you plan to use quite a bit 4k 100/120 the R5c is noticeable sharper than the R5, can also record audio (separately on the SD) but does not have Face AF in 100/120 fps. I try not to use the R5 in 100/120 as the quality is not too great and the editing is a pain due to h265 10bit 4:2:2, R5c XAVC so much faster.

One recent R5c 4k 120 fps segment. Don't look at the motion cadence as it was shoot at 1/2000, F2.8. It was a test for a lens and I did not have an ND filter for that lens diameter.
https://www.youtube.com/watch?v=7AjNP0MdwXs


Fro anything slow motion R5c wins hands down with 8k and 4k 60p and better quality 4k 120...

Thanks although some of those solutions don't seem available any longer (anker 45w power bank).
Again what are the exact 8K60p power requirements? I know we've discussed this earlier in the thread but I don't feel like going through +35 pages lol.
As for the Z8, it is great that it can power 8K60p from its internal battery but yeah I've seen some 8K tests getting the camera to overheat in 10mn which is a concern. Other test show 25mn. I think the Z9 doesn't overheat and with second hand prices being around what a Z8 costs I think Z9 might be actually be a better choice if you don't mind the weight too much.

Straight from my bookmarks:
https://www.instagram.com/p/CcSnQZ4vqnl/
Canon R5C USB PD External Power - Power for 8k60 using USB PD- Record times on the Anker Power Bank | Anker USB Power Bank | FXLion Nano 2 Power bank + other adapters on the description
https://www.bhphotovideo.com/c/product/1596728-REG/anton_bauer_8075_0271_p_tap_to_canon_9v.html
https://www.usa.canon.com/shop/cameras/camera-accessories
Canon R5C - Compact Rig & Battery Solutions
 
Hope it helps!
(still on Z8 wagon though for now... even though, overheating issues really concerns me!)

As others have stated the AI/computational stuff you get from phones, drones etc shouldn't be compared to what you're getting raw from a mirrorless cam. It's definitely going to take more work in post and more effort during shooting to get there.
FYI Z9 recently got a 4.0 FW update that adds a low (100) ISO mode to N-log. Early reports suggest noise is gone. This firmware should be coming very soon to Z8 and hopefully be a bit of a game changer when it comes to noise issues with N-log.

IBIS with non-CPU lenses works if you type in the focal length and maximum aperture into the list of non-CPU lenses that you use. This includes mechanical-only lenses that don't have electrical contacts.
 
https://onlinemanual.nikonimglib.com/z8/en/sum_non-cpu_lens_data_guid-fac0444d-3965-c25a-4c18-84574cb10167_285.html
 
After typing in the data for the non-CPU lenses, you can then select from the list the actual one that you are using and the data is recalled. This can be programmed to a custom function button.
 
The AF speed in video recording is adjustable:
https://onlinemanual.nikonimglib.com/z8/en/csmg_af_speed_guid-a4c4cd1b-0ad3-5c90-eac7-5c2fb524a4b5_247.html
 
and tracking sensitivity also:
 
https://onlinemanual.nikonimglib.com/z8/en/csmg_af_tracking_sensitivity_guid-54657d66-753f-7fcb-b56b-2b78446094a0_248.html
 
For me the video AF has been excellent on the Z8.

Gopro, uses a tiny sensor with extremely short lens and very high shutter speed. The movement magnification of a FF with a 35mm compared to a Gopro is just a complete other order of magnitude. 
Unfortunately any digital stabilization requires a high shutter speed to be more effective, put a ND on a Gopro and 1/50 and the great stabilization is gone.... 



In my experience, and I posted multiple times, any lens above 70mm that has IS for video performs better on the R5c than R5 (in my case 70-200, 100-500) and I do a lot of handled, of course I'm not walking or running, for this you need a gimbal.

Below 35mm on the R5 you will get wobble effect especially if you walk or pan rather fast. So a R5c with an IS lens wins here. 

IBIS is very useful from 35 to 70mm on non IS lens. I use quite a bit a 28-70 2.0 that does not have IS and I tend to use it handled on the R5 or on Gimbal on the R5c (there is really no contest against a gimbal if you walk.... gimbal wins by huge margin).

I did test but I never use Digital IS, I prefer to stabilize in post in Resolve if needed. I also shoot mostly in RAW so Digital IS is not available. Would be cool if Canon would embed the gyro data so we could do digital IS in post, but if you look at Sony catalyst or Gyroflow both requires high shutter speed to be effective.


Probably for @Django the question would be how well it compares R5+IBIS+RF 24-70 vs R5C + RF 27-70, handheld both static and walking. Unfortunately I don't have an RF 24-70.... but once I should try with the RF 35 1.8 IS to see...

 

Just sharing my likes/dislikes about the Z8. No camera is perfect and I may very well warm up to it with more time spent with it, so take my comments with a grain of salt. Its definitely a very high-spec tool at an aggressive price point. Again I love the body size, the stacked sensor, the high-resolution, and the codecs. Camera just seems to have some quirks both in operation and output.
Yeah RF isn't a good solution for third-party lenses. But the native ones are really top level albeit pricey and you can adapt certain lens systems to RF.
45mp is obviously great for substantial cropping. Didn't realise how useful it was until I started messing around with +45mp files. Now I can't get enough it..
And yes R5C has DIS that you can combine with OIS. Found this video about it:
 

So I've now tested out the Z8 and like I said in that thread, I got mixed feelings about it. I love the body size, build quality, LCD hinge system.. but I hate the UI, menus, layout. N-Log is a can of worms with currently horrible rec709 LUTs that kill DR and boost saturation. Camera has weird quirks like no IBIS when adapting certain lenses and other options that get greyed out depending on settings. The AF is a little sluggish. Etc. I guess to me its a great camera on paper but not really for me in actual use (I've found that to often be the case with Nikon cams).
So for the moment I've written it off and am back on Canon/Sony bandwagon. I recently did a hybrid shoot with an R5 with latest OS and actually really enjoyed the shooting experience & the files. Camera felt super snappy, didn't skip a beat. Decent battery life & didn't run into any overheat issues. The downsides are the camera feels a little cheap, 30mn video limit sucks for long form content, no exposure tools, no magnification during recording, 8K h26x is hard to edit on an M1.
R5C has all those video options plus 8K50p, LUT support etc. So the camera is back on my list. The battery life now being a non-issue in XFAVC is a huge plus for me so I guess the only real downside is lack of IBIS. That's kind of a big one. That said I did my entire hybrid shoot with the RF 24-70mm F2.8 which I thought was quite a phenomenal lens and it has IS. This RF lens was quite an eye opener, and I might just retire my EF lens collection and start investing in RF. So my question is, would the R5C + RF 24-70mm be usable for handheld video? Would I be missing the R5's IBIS much? I really just don't want micro-jitters and hate using post stabilisation. 
Another Canon option is the R3. I've played around with it quickly and the ergonomics are just perfect. The video IQ is superb but the stills are "only" 24MP and I really love the 45MP files from the R5/R5C. Just feels weird paying more for less, even though the stacked sensor does bring other benefits. I guess an R3+R5C would be my dream combo, maybe I should start saving for them!
 

Currently I would say yes Z8 is probably the best hybrid in the market but for sure but not gonna switch to Nikon and then switch to Sony and then back to Cannon 🙂 
Imo the more rational path is you invest in either Sony or Canon ecosystem and stick with it, some years you will have the "best" camera and some years not but you save a lot of money in not switching back and forth and you develop a lot of automatisms too.
Nikon has some really cool unique lenses and Z9 and Z8 at the moment are the best in class imo, but there is no cinema ecosystem and not yet good budget friendly hybrid cameras... so at the moment if you want to grow or downsize is more tricky than Sony or Canon. Canon has the advantage to share the mount with RED and a no brainer EF support, Sony is much more open to third parties lenses. 
 

Had a quick go at the Z8 the other day. Shot some 8K ProRes test footage with a vintage Nikkor AIS lens and the Z 35mm f1.8.
I have mixed feelings about it. For some reason the IBIS was disabled on the AIS lens, not sure if that's the case with all adapted lenses or not but it was rather disapointing (VR and EIS was greyed out). That said, it was pretty glorious seeing that vintage lens in 8K for the first time! 
N-Log is kind of a can of worms. Footage is pretty noisy at ISO800 and yeah the provided Nikon LUTS really do suck, horrible highlight roll-off that kills the DR. The info is there though so you'll get better results going manual.
The menus and button control is probably the worst from any system, sorry Nikon it really does my head in. Also the grip felt sticky which is not cool. The size/weight is just right, love the LCD hinge system and overall build quality.
Just a quick first impression so I guess take what I say with a grain of salt. I do like the camera despite my few gripes and might even try renting it to spend more time with it as again the menu/UI takes a lot of getting used to.

Had a quick go at the Z8 the other day. Shot some 8K ProRes test footage with a vintage Nikkor AIS lens and the Z 35mm f1.8.
I have mixed feelings about it. For some reason the IBIS was disabled on the AIS lens, not sure if that's the case with all adapted lenses or not but it was rather disapointing (VR and EIS was greyed out). That said, it was pretty glorious seeing that vintage lens in 8K for the first time! 
N-Log is kind of a can of worms. Footage is pretty noisy at ISO800 and yeah the provided Nikon LUTS really do suck, horrible highlight roll-off that kills the DR. The info is there though so you'll get better results going manual.
The menus and button control is probably the worst from any system, sorry Nikon it really does my head in. Also the grip felt sticky which is not cool. The size/weight is just right, love the LCD hinge system and overall build quality.
Just a quick first impression so I guess take what I say with a grain of salt. I do like the camera despite my few gripes and might even try renting it to spend more time with it as again the menu/UI takes a lot of getting used to.

Had a quick go at the Z8 the other day. Shot some 8K ProRes test footage with a vintage Nikkor AIS lens and the Z 35mm f1.8.
I have mixed feelings about it. For some reason the IBIS was disabled on the AIS lens, not sure if that's the case with all adapted lenses or not but it was rather disapointing (VR and EIS was greyed out). That said, it was pretty glorious seeing that vintage lens in 8K for the first time! 
N-Log is kind of a can of worms. Footage is pretty noisy at ISO800 and yeah the provided Nikon LUTS really do suck, horrible highlight roll-off that kills the DR. The info is there though so you'll get better results going manual.
The menus and button control is probably the worst from any system, sorry Nikon it really does my head in. Also the grip felt sticky which is not cool. The size/weight is just right, love the LCD hinge system and overall build quality.
Just a quick first impression so I guess take what I say with a grain of salt. I do like the camera despite my few gripes and might even try renting it to spend more time with it as again the menu/UI takes a lot of getting used to.

Had a quick go at the Z8 the other day. Shot some 8K ProRes test footage with a vintage Nikkor AIS lens and the Z 35mm f1.8.
I have mixed feelings about it. For some reason the IBIS was disabled on the AIS lens, not sure if that's the case with all adapted lenses or not but it was rather disapointing (VR and EIS was greyed out). That said, it was pretty glorious seeing that vintage lens in 8K for the first time! 
N-Log is kind of a can of worms. Footage is pretty noisy at ISO800 and yeah the provided Nikon LUTS really do suck, horrible highlight roll-off that kills the DR. The info is there though so you'll get better results going manual.
The menus and button control is probably the worst from any system, sorry Nikon it really does my head in. Also the grip felt sticky which is not cool. The size/weight is just right, love the LCD hinge system and overall build quality.
Just a quick first impression so I guess take what I say with a grain of salt. I do like the camera despite my few gripes and might even try renting it to spend more time with it as again the menu/UI takes a lot of getting used to.