Don't think I've seen a game on the PS3 with better graphics than Final Fantasy 13. Yeah, the game had issues, but graphics wasn't one of them. In fact, I liked that most areas were well lit with bright colors. Any game that is mostly dark or with lots of browns and greys does not have good graphics, IMO.
The other game that comes to mind is Valkyria Chronicles. The art style was so unique when it first released that it really left an impression on me.