If you kids with your fancy 4K moniitors want to view 4K programming, you should check out CuriosityStream service.
I believe most of the shows are finished in 4K format, but of course, not every shot in the shows will have been shot at 4K.
I have edited 4K shows in the past, and only saw the shows at the 4K resolution at the very end of the process.
Actually edited at 1080P; 4K required too much horsepower for the regular offline process.
Standard def to HD was the game changer for me, kinda underwhelmed by 4K. It all depends on the monitor...
Still digging my Panasonic plasma.