Wow! I had this HD-DVD release and didn't know it!!
Man, I must have bought it, shelved it and never bothered to view it.
So last night I spent some time comparing it to the extended SD-DVD version i have and found that yes, grain was in-tact, resolution was visibly higher, even on a 47 inch set, compression artifacts were gone, color had more clarity and pop. It was just superbly improved over the dvd.
Now, it is not a top end title. But it looks like the film should look. I saw this in a theater and the images were not sharp as a tac.
Audio was great, with no ****ed up pitch.
So the BD is highly recommended. Heck, if the re-encode for a BD50 you might even have something nicer.