Avatar 480p vs 720p vs 1080p vs 2160p
480p / 720p / 1080p / 2160p displayed in Avatar (2009)
All resolutions are official BluRay-DVD Rips except 480p. (I had to downscale the resolution to 640×480 myself.)
The 4K version is an HDR 4K (2160p) BluRay Rip. Which is why the colors seem 'washed out' or more gray.