I think the PS3 version of Assassins Creed looks better on stills. Unfotunately I've played it aswell, and compared to the 360 version, its a bit choppy (especially when you get to big areas). I think Ubisoft cranked that version up a bit considering the PS3's hardware, but didnt quite manage to get it as stable as the 360 version. On Half Life 2 and GTA 4, the stills look a bit blurry on the PS3 aswell. I've played both these games on both consoles aswell and Half Life looks fine in motion on the PS3, but GTA looks a bit blurry compared to the 360 version.
The only type of plane that would make sense in a city like Liberty City (New York), would possibly be a small plane with one of those commercial message thingies hanging on a line from the back of the plane.
CryTech's comments