For me, MGS2 and Silent Hill 2 blew my mind when it came to visuals. Same thing for me since then, not much surprises me or moves me when it comes to raw visual power.
Even for the 360/PS3 gen, what would made it a huge leap was the online functionality as a whole and how many digital things were introduced. There were definitely games that looked amazing and made the leap justifiable when it comes to visuals, but games themselves changed a lot.
This gen is the end of last gen with a new coat of paint, and the paint isn't popping.