'The Dark Knight' is a very good tester and a very good film to boot. The beginning bank job scene (and a few others through-out the film) is shot in IMAX, so you don't get the black bars at the top and bottom of the screen.
Personally, I think chapter 6 from 'Knowing' takes some beating for sound and visuals and all out jaw-droppability, but the film itself isn't as good as 'Dark Knight' (I seem to be in a minority that actually enjoys it).