2016-05-14, 19:59
Ran a quick test on the Sony Jeep 10bit video from the site you linked. So far it doesn't look good. This was using HDMI however (which has the audio issue) so I can't say if that impacted playback. The video was VERY choppy.
Running the same video on the Shield... ran smooth as butter in 4k.
Running the same video on the Shield... ran smooth as butter in 4k.