These are probably the best dressed of the night:
Bradley Cooper in Tom Ford:

Wouldn't change much with his tuxedo. Although, in some other photos you might seem some collar gap. Might have also considered going with a wing collar since he's wearing peaked lapels and maybe added a pocket square, but I thought he looked quite sharp.
Christoph Waltz in Prada:

Nice to see a tuxedo in midnight blue. I thought his fit him better than Daniel Day Lewis' tuxedo as you watched them move up the stage to accept their Oscars. Biggest point of contention would be to show more cuff. Next biggest: the flap pockets. Smallest point would be the lack of a pocket square.
Hugh Jackman in Tom Ford:

Probably my favorite of the night with a double-breasted shawl collar in a 6x2 configuration.
EDITED to add Chris Pine in Ermenegildo Zegna:
Edited by thesilentist - 2/24/13 at 11:10pm