I have a 4K hdr tv. Stuff does look better, but it's not too noticeable. I notice the hdr more than anything, but even that I think is because I've been able to compare some stuff side by side. PS4 pro also allows you to pick settings on pro enhanced games to favor graphics more or performance more. I think there is a setting that can boost performance on non pro enhanced games too. I never had too much trouble with performance of PS4 games though on the original system, so I've probably not played the games where the better performance of the pro is worth it.

I don't do a lot of heavy gaming on my PS4 though. I tend to play the PS3 more. If you have the money and are getting a new PS4, might as well go with the better one I guess. It's not as big a price difference as the Xbox x or whatever it was called. It just won't be a night and day difference between the systems. If I were living by myself, I wouldn't have found the upgrade worth it. That's just me though.