Decided to take a stab at it and this is the best I can get it. Make sure to watch it in 4k with either Flash or the HTML5 player which only allows you to play at 4k with Chrome or Opera.
It's 1080p footage upscaled to 4k, but that's necessary to trigger 4k on YouTube which allows for (much) higher bitrates.
It's 1080p footage upscaled to 4k, but that's necessary to trigger 4k on YouTube which allows for (much) higher bitrates.