Out of the blu-ray movies I have, the best picture quality may come as a surprise - and this is with my TVs fully calibrated (Samsung and Philips flat panel LCDs - Samsung 1080i, Philips 1080p).
The best picture comes from the movie Cars. I watch that one quite frequently because I have a 15 month old son. So far it is the best picture. For animation, a close seconds would be Ice Age Meltdown. If you're asking about live-action, Casino Royale (which you mentioned) is one of the better ones I've seen. I, Robot has a really nice picture, Independence Day was better than expected but not quite on par with some of the newer releases, IMO. The POTC series, as mentioned above, does look really good, also.