Reading the Blu-Ray review for Up, I would take this statement and drop in Wall-E for the movie, and the same would be true:
"Up brushes against the stratosphere with a dazzling, picture-perfect ... transfer that boasts more breathtaking spectacle and stunning scenery in a single shot than many high definition presentations deliver in two hours."
I can't comment on Up since I don't own a copy, but I can say the same holds for Wall-E.
Watching a Pixar movie on Blu-Ray made every single hedge I ever had about the format completely disappear.