Came here to add that I rented Lego Batman through iTunes and was disappointed in the PQ. I already have a ~35 Mbps BR rip of the movie that I compared with through Plex and rented it to test out my new ATV4K. I thought a very recent computer animated movie would greatly benefit with a 4K viewing but the BR version was equal to or better than the iTunes 4K version, which appeared soft.
This is with Quick Start on, 100 Mbps FIOS connection with the ATV wired to a gigabit router. And I watched the entire movie straight through so it wasn't a case of me comparing when the stream didn't have a chance to change to 4K.
One could argue that a streaming service can't compete with a full bitrate BluRay, but then I'd ask what's the point of upgrading to a 4K streaming box if an upscaled 1080p image is just as good?
This is with Quick Start on, 100 Mbps FIOS connection with the ATV wired to a gigabit router. And I watched the entire movie straight through so it wasn't a case of me comparing when the stream didn't have a chance to change to 4K.
One could argue that a streaming service can't compete with a full bitrate BluRay, but then I'd ask what's the point of upgrading to a 4K streaming box if an upscaled 1080p image is just as good?