I guess John Carmack is seeing a little bit of the light with the PS3's Blu ray player as an interview with him he indicates that his new game "Rage" will look worse on the Xbox 360 because it will need to be compressed on 2 discs.
http://www.shacknews.com/onearticle.x/53976
If I'm not mistaken, didn't Carmack slam the PS3 either earlier this year on late last year?