These are the best looking films I own on Blu, in no particular order, so I can vouch for pic quality.
My library of High Def media (Blu & HD DVD) spans 90 films/shows) and I watch them on a Full HD Panasonic Neo Panel Plasma the retailed for $2800 and is considered one of the best of the '09 models.

1. Dark Knight
2. TF1/ROTF
3. Ironman
4. Anything from Pixar (Up looks particularly stunning, I also own Wall.E & Ratatouille on blu)
5. Fight Club
6. Tropic Thunder
7. Spider-man 3 (it looks great, that's about it :P)
8. Star Trek (new one)
9. Hellboy 2
10. Monsters vs Aliens

I'd love to recommend Terminator 2, but they went overboard with the noise reduction and it really hurts the image depth. A must for big fans, like myself, but not really reference material.