well I can tell from the first scene it would be:
SPOILERS!!!
1. after fingers being eaten you see blood squirt from the hand, it's cut in the widescreen, you just see the hand move away from the mouth and blood on the window
2. they show the eaten fingers longer (on the hand that is), right before the zombie spits out the other parts of the fingers
3. more stabs in the back are shown
4. a close up of the brain of the laboratory worker with the boiling sound, right after he awakes from the dead
5. the laboratory worker eating the leg of his collegue is shown longer, you can see blood come from his suit
END SPOILERS
this is just the first gory scene of the movie, I can make screenshots if you want to
I know the asian shop owner has some nice parts too that are cut from the widescreen version.
So basicly the widescreen version looses some image and scenes and is blocky... avoid at all cost