4k HQ is when they sample the sensor at 8k so have R+G+B data for every pixel in the 4k video (c. 8M pixels).
So for comparison a A7sIII makes its 4k video by interpolating:
4M Green pixels
2M Red pixels
2M Blue pixels
The R5 uses:
8M Green pixels
8M Red pixels
8M Blue pixels
I'm hoping NFS will be along with a comparison at some point...
Most of the modes the Canon overheats in those cameras don't have...
Also as a GH5 owner the idea of usable video AF would be attractive on occasions... I don't think I'd use CAF for anything serious on any of the Pannys...
I think it depends just how good the 4k HQ is. If having R+G+B info per pixel is a big step up from only having R and B every 4 pixels I think people will make some use of it. It's not like you can get that elsewhere...
Epic, thank you so much.
When you've recovered I'd really appreciate your impressions on the R5 4k HQ vs the A7sIII's 4k? (Big pixels vs R+G+B info per pixel.)
Oh and is the 1 hr cool-off period for when an A7sIII overheats (as you previously said Sony told you) realistic?
Definitely the pre-amps...
Also IBIS with EF lenses.
There really aren't, as the Canon will do 4k/30 indefinitely so you can only consider cameras that perform above that. So no Sonys (well, for a week-or-two), some Panasonics, and maybe you're done... Good luck with the Panasonic AF. (I use a GH5, BTW...)