This generation had a pretty dramatic leap. Your average open world game on ps4 looks miles better then the best PS3 game. Games like the order AND GOW looked like CGI most people didn't believe PS4 would be able to run it. Honestly seem like you just don't wanna be impressed.
But is the leap as noticeable as previous gens? I think that's the point, here (well, maybe not Liquid_Laser's point, anyway). Open world games do look a lot better on PS4 than on PS3, but by comparison, open world games were barely even possible on PS2, with only a few ones to have actually been successful at it (GTA and Shadow of the Colossus come to mind, the first one having horrible graphics and the second one having horrible framerate despite being extremely minimalistic). In technical terms, the gap between consoles might not be necessarily diminishing, but the result we see on screen sure is, which isn't to say modern day AAA games aren't visually impressive.