http://www.youtube.com/watch?v=o921p4TIzH4&feature=related
Watch the trees and the water at the beginning for the ps3 compared to 360, 360's water looks more realistic, and if you pay attention to the first tree, on the ps3 version it looks more bare thna the 360 one.
Also at 1:20 note the water effects from ps3 compared to 360, and the 360 has water dripping down from the cieling in the ps3 version you see none of this. Water effects are worse for ps3
The tree is more populated yes, but the edging on the xbox has significantly more tear, especially in the combat sequences, theres small dots of white appearing around the imperials armour. When fighting the giants, there is more "ground" being thrown in the air, as well as better dust effects, whereas the xbox version is less translucent, more opaque block colors, as well as some rocks being thrown in the air that have no depth whatsoever.
As i say.. when upscaled into 3D, the ps3 version comes out on top purely because it has significantly more depth of shadow than the xbox. I agree to those not running on large LED screens it wont be as noticeable, but when your TV is made to display color as deep as it can get, the differences show up further.