You will not notice inherent graphics differences in the games. Whatever differences there will be will be marginal and not important.
What IS important is how the architecture makes developing EASIER, not prettier. PS4's RAM is certainly fast, but I'm far more interested in how developers will be able to make games faster, smoother, and just flat out better thanks to the easier architecture.
Desktop: AMD Phenom X4 955, ATI Radeon 7950 :: Laptop: Intel i7-3532QM, ATI Radeon 7670m
Consoles: 3DS XL, PS Vita, Zelda 3DS, PS3 Super Slim, DSi, PSP Go, PS3 Fat, Wii, GameCube, PS2
Now Playing: Metroid Prime 2, Dark Souls, Fallout: New Vegas, The Legend of Zelda: Oracle of Ages, Persona 4: Golden