I have a Sony X800 and Roku Ultra for my streaming needs, and normally use the Sony as I like the gui better. I was watching Space Force on the Roku one day, and noticed color banding and thought that it was weird because I've never noticed it before with Netflix. Switched over to the Sony and the same scene, there was no color banding. Not sure why the Roku was doing that, but both are set to 4K, and I have 100 mbps internet connection, so it wasn't a bandwidth issue. Nothing against the Roku, and the screen saver is actually pretty cool.