I have been shooting on both the A7sii and FS5 for just over a year now. I also picked up the 5D4 to replace my 5D3 when it came out, so speaking from personal experience I can confidently say the 5D4 is a huge improvement on its predecessor and it has many advantages over the Sony cameras many people love. The 4k mjpeg codec is heavy but I have been very pleased with the range it gives in post both for colour and for cropping/resizing as the image is consistently clean and beautiful. It goes without saying, it does not have the perks of raw recording and I definitely miss the other ML functions. Despite that, the 5D4 is tack sharp in 1080p 24/30/60 and 4K modes, and yes the 720 is slightly softer (as I expected). The camera also records 120fps in 720p with a surprisingly high bit rate (150mbps if memory serves me right) that hardly shows any artefacts (if any) and prevents the image from from falling apart in post. Looking at images from the two cameras side by side leads me to believe that the Sony is also recording 120fps at 720p but upscaling it internally to give the impression that it's reaching higher specs than it's competitors. It's also worth noting that the Sony's mentioned here both shoot UHD 4k and not true 4k, which means they're shooting 3840x2160 instead of 496x2160 like the Canon. Now, the biggest downfall to Canon's flagship DSLR is that the 4k recording suffers heavily from rolling shutter (as does the A7sii) and the 5D switches to a 1.74x crop mode to do it, which for many shooters is a disappointment because we've been spoiled by the shallow dof of full frame video for the last few years. However, that being said 1.74x crop is very close to Super 35 and I personally haven't found this to be a negative but a positive because a good dp/videographer will know which lenses to use to achieve the desired results and I actually appreciate gaining that extra reach out of all of my lenses. The only other downfall of the 5D4 is that the only way to achieve an s-log look is with Eoshd's reverse engineered c-log picture profile which I haven't really put through all it's paces but on first glance looks very promising. Apart from those few minor weaknesses, the 5D4 doesn't look like it at first but it is a hell of a camera and a welcomed upgrade to anyone who didn't jump on the Sony bandwagon.
A side note is that for those who prefer an easier workflow, the 5D4 blows the Sony's out of the water from the on set accessories right through post production. To elaborate on that, most Sony lens options are disappointing and have electronic zooms or focus rings which make follow focus rings unusable as the rings change their marks depending on how fast or slowly you move them. So most people will pick up a Metabones or Fotodiox adapter to fit EF or other third party lenses which means you lose AF functionality and depending on the lens, 1 out of 20 times the body doesn't read the lens properly so you need to power down, remove the lens, power back up and this becomes very annoying when you're on a high stress shoot (not to mention the tiny A7sii batteries which barely last around 30-40mins at a time so you need to bring a bunch or have a charging station handy). Also for those of you who haven't yet had the opportunity to shoot on a Sony, every time you format a the card, the file system re-starts the next shot at 0001.mp4, 0002.mp4 all over again, which means you need to batch rename your clips before editing or you'll have a hell of a time reconnecting a project in post if you move it from drive to drive because you run the risk of having duplicate file names in the same bin. The only way the Sony sensors retain their highlights (which I have to say, they do very, very, very well!) is by shooting in s-log 3 which means the base iso jumps up to 1600 and 3200 on the A7sii and the fs5 respectively. This higher iso necessitates the use of ND filters both indoors and outdoors depending on your lighting scenario and ND filters from brand to brand have different hues than the internal variable ND in the FS5 so when you get to the colouring stage of post production, not only is there already a big learning curve for slog3 colouring but if you mix cameras or use ND filters on your lenses, the blacks can vary in hue making colouring even more difficult. Meanwhile the Canon sensor retains all iso options and is clean for video well up until 6400 which I don't think I've ever really shot past on a Sony and been happy with the results, so for low light performance the Canon's are on par (for my needs, at least). The 5D4 also outputs natural colours and skin tones which many users will find familiar and easy to correction/grade, keeping the post prod workflow simple.
All this to say, I'm excited and eager to see if ML ever comes to the 5D4, the team here has done a wonderful job and the feature I miss the most is the magic zoom! Please guys, give us some updates on a nightly!
This sums up my feelings exactly regarding both the Sony a7r2 and a7sii vs now my extensive experience with the 5d4.
The canon is absolutely tack sharp and the tracking is game changing for me. I shot a recent project at 1080p 60fps and was blown away.
My only gripe is the codec for post processing it's just too large for premiere and my Mac Pro chokes on it. However, it's actually pretty decent. Again sharpness is impressive.
The dynamic range, noise levels, and sharpness vs the 5d3 are so much better. From a stills standpoint it's a worthy upgrade.
Eager to see what the new firmware does for the 5d4.
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