Come on Mosquito, you're smarter than that!
It's a 23 year-old FILM that was quite grainy to begin with (especially the dark scenes), even when you saw it in the theater back then, and it probably wasn't stored and taken care of properly either, which makes good restoration harder and I don't think they an internegative left to work with they had to do it with a used print. To get a grainless disc, they would have had to use a LOT of DNR or similar noise and grain reduction technique which would have altered the film as it was shot! (You don't want the George Lucas/STAR WARS special edition treatment do you?)
Synapse spent a year restoring the film and used the best company out there to make it look the best possible, I don't think you could have topped that without going into "plastic surgery" altering the film because loosing too much grain or noise (which isn't the same by the way) makes loose other things. Because you've seen old films looking sharp or grainless doesn't mean it's always possible or that it's a good thing (like it's so much that it's a cheat to the audience because that's the movie anymore).
By the way pop in the DVD to check, I don't think there's any comparison! And sorry I got on my horse, but reading that made me jump to the roof.