I wrote up a little something on it, but it isn't really valid because I have a 480p projector. Basically I could just tell it's a lot less noisy than the DVD release and has more vibrant colors in the city scenes. There's not a ton of fine detail gained simply because the movie was filmed in tons of low light situations.
EDIT: Oh, and the dialogue is more intelligible than the SD's DTS soundtrack, and the surrounds are used a little more flowingly, too (In the two or three scenes that actually use them.).