saw it twice in two theatres...
First time I saw it I noticed the grain, etc in the dark scenes (a good example was when Anakin and Padme were talking in the dark on Naboo). The image just wasn't as crisp as I would have liked it to be.
Second time I saw it, I saw it in a theatre with digital projection since the image looked much much crisper and there was no grain to be seen. It looked fantastic.
I even made a point to see if it was there for my second viewing.
Lesson learned: See AOTC in a theatre with digital projection. It was like VHS vs. DVD