j'ai trouvé, voici le lien sur la preview de IGN
http://uk.xbox360.ign.comcom/articles/855/855555p1.html
c'est le 3éme paragraphe
For the first time, Rockstar gave us hands-on access to both the PS3 and 360 versions of GTA IV. The good news is that no matter which system you prefer, you're going to have a great-looking game to play. There are only some minor visual differences noticeable between the two preview versions. The 360 build is brighter and has slightly more vibrant color while the PS3 build has less aliasing issues.
gtalegende a donc mal traduit, la 360 a des couleurs + vives mais la PS3 a moins d'aliasing