No surprise really. This is going to be the norm all gen. Well, unless MS starts shelling out tons of cash on a new parity clause. For the time being, I'm glad we have gone back to the ways of previous gens, where devs try to get the most they can out of a system, even if the game is multiplat. So, for a while, we'll be seeing devs sacrifice resolution and/or framerate to try and achieve the same graphical quality/effects.
Also, it makes me laugh inside everytime I see a Xbox fan downplay the differences, knowing full well last gen they were dissing PS3 multiplats for some of the smallest things.