jlippo, thanks for the clarification. But how do you explain the fact Xbox 360 almost never uses any anisotropic filtering in their titles and PS3 does? If Xbox clearly has "better" graphics hardware, including the super-fast EDRAM, why would developers sacrifice AF on this console? For the sake of FPS? I don't think so. For the 4xAA + HDR? Maybe? I thought this was a matter of disc storage space (dvd9 vs. blu-ray), but you said AF has nothing to do with memory, so I am more and more confused.
comparison video for instance: when you look at the ground, you see there are much more detailed graphics for the PC version of the game. Is that AF, tesselations or simply more graphics objects?