I would say none of these demos look truly photorealistic, as in looking like a photo, or a live-action video. Out of these examples, the Unreal Loft demo probably comes closest, along with perhaps the Mizuchi Museum demo, though that has a very narrow focal range hiding any potential imperfections behind lots of lens blur. And of course, the thing these two demos have in common is that they are limited to a single room with little organic material. There are no humans or animals with unrealistic skin and chunky hair, no cloth or plants blowing in the wind, no complex character animations or collision detection between objects. They are not actually games. To be fair though, even big-budget films tend to struggle to make CG look realistic, despite it not even being rendered in real time.