At a quick glance it might be useful for people to see what's available that shoots 4K - everything stills-video (not camcorder), with a large-ish sensor and 4K video. Here's my list off the top of my head. I'll add to it based on your suggestions and I've missed!
Full frame 4K
Canon 1D X III
Canon EOS R5
Canon EOS R6
Leica SL2
Leica Q2 *
Nikon Z6
Nikon Z7
Nikon D850
Nikon D780
Panasonic S1
Panasonic S1R
Pa
Gyna speedbooster with the brand name "Fotasy." 1980's era Nikkor 50mm, mostly at f2. When that lens goes to f1.4 it halos and fringes like crazy. The overall color changes a bunch too, so we don't really use f1.4 much. On the camera we used the default "Natural" setting. Shutter speed was mostly @40, except for the 1080 60p 60ss slow-mo stuff. That's about it. When I had my EM5II I didn't really like how color balance would shift rapidly on the WB setting. Still not pleased with auto W