Gamedaily: 10/10 for both
http://www.gamedaily.com/games/grand-theft-auto-iv/xbox-360/game-reviews/review/5925/2017/
For the record, I really hope the PS3 version doesn't keep the 100% average. It may or may not end up beating Zelda OOT (which would be fine) and may well end up higher than the 360 version, but doesn't anyone think that, cumulatively, the very minor complaints they have about the game should take it down at least half a percent?