Just checked and no banding at all!!!
OMG this is the first iTunes film that i've heard with Dolby Atmos. DD+ is so clear - everything on the film simply sparkled from speech to sound effects to the music soundtrack. WOW the audio on the film was truly alive. SHAME that the film was so terrible though and a SONY pictures with crappy SONY smartphones and Dell computers in the film - not a single Apple product - poor showing SONY and what a low budget film too. Gutted that I bought the film as oh damn, I really don't want sit through that again!
But well done Apple for a super clear DD+ Atmos.