The Blue Planet series, the Planet Earth series, Dynasties, and more are all fantastic demo discs. I do prefer the sequels of Planet Earth and Blue Planet over the originals, especially in UHD. I have several notes on both of these discs, but my favorite to show people is Blue Planet 2 episode 5 “Green Seas.”  The colors of the different species of fish (especially the cuttlefish and mantis shrimp), corals, and some of the shots of the sky are unreal.