What system advanced the most graphically from its launch games to its peak?

[smroadkill15]

I don't really have to qualifications to say since I really only started to game during the 6th gen so based on my personal experience, Ps3/360 were the largest. Gears of war compared to Gears of war 3, Uncharted to Last of Us/Uncharted 3, Resistance: FoM to Killzone 3, Forza Motorsport 2 to Forza Motorsport 4, Cod2 to Cod: Ghost, GTA4 to GTA5, Mass Effect to Mass Effect 3, Halo 3 to Halo 4.