Gameplayer was lucky enough to score some post-E3 time at EA's Vancouver studio playing FIFA 09. In this article they detail why FIFA has made the necessary improvements to out perform PES for the first time in years.
"The brilliant new animation technology extends beyond looking sweet and making the Ronaldos and Rooneys of the world carve it up on-screen like they do on the field. The whole game world feels more alive. Collision detection has been pumped up impressively and is now dynamic, so rather than getting canned 'stacking it' animations when two players collide they will dive heroically in every way imaginable depending on both the players body positions and momentum at the time and the point of collision."