Anyone saying it looks like a PS3 remaster is just trolling. We have a remastered PS3 game on the PS4, conveniently enough from the same developer. I doubt anyone without an agenda would try to argue that TLOU:R looks equal, or even close to UC4 :p
Anyway, yeah, it is pretty much impossible. Not just because of the existence of top tier PC hardware, but because people are so unreasonable with their expectations these days. It's impossible to please everyone. You make a title like QB or TO:1886 and people will complain it's too linear or not 60fps. You target 1080p/60fps or try to create large open areas with a HLOD, and people will complain it doesn't meet the standards of titles that target neither.
On a side note, UC4 did have some pretty visible performance issues. That's to be expected though, considering how far from release it is. I don't think it was entirely ready to be shown, but they must have felt it was important to have it at PSX.
