I'm not sure how much of this is in my head, but when I first saw 4K sitcoms, their house looked like a movie set, not a house. It looked too real so the illusion was broken.

Watching a movie on my new smart TV, the actors looked more like actors, and less like the characters they were portraying. This could be from some other feature, like AI upscaling or something. But something is definitely off.

It could be it's just different and I'll get used to it, but I haven't yet. I haven't watched much on that TV yet though to tell.