Check "Roman Klein 4K3D" for Ultra-Realistic 3D imaging
Stereoscopic photographer Roman Klein (Austria) is publishing a free online 4K3D pictures repository. Pictures are Oculus Rift compatible and make use of every pixel of all leading edge 4K/UHD-3D TV sets. The web site features a Phereo stereoscopic viewer.
All available 3D pictures offer 3840x2160 pixels resolution or better with a 16:9 aspect ratio. The sample you see here is downsampled to 640 pixels and rendered in Red-Cyan for your cheap cardboard 3d glasses, but on the web site, Phereo will give you access to up to 2560x885 pixels. For the full 4K viewing, see recently published slideshow-videos on his YouTube channel "romanklein3d"on a 4K/UHD-3D smart-TV.