We rented this last night - pretty fun movie. Jack Black was great.PQ was top notch indeed. Detail stunning and the colors with the rich greenery, etc. was really good. Excellent shadow detail too in some of the darker scenes. Audio was also top notch - my surrounds are actually mounted near the ceiling and really gave great effect. One thing I like was how the dialogue was balanced with the louder scenes. So many new movies have dialogue too low relative to the loud/action scenes (presumably for more dynamic range).
I have started to buy this movie a couple times now. Have not been able to make up my mind.
I'm one of the few people left in the world who is fortunately surrounded by three Family Video stores - one is just a mile down the road. They carry all new UHD BD releases (except catalog titles) for just $3.50 a night. If I didn't have this option, it would be a hard choice but I would probably be buying more, selling off the digital code and then the disc over at the Blu-ray site for titles I didn't want to own.