I’m still in awe after watching The Third & The Seventh. It would be amazing based on content alone, but it is almost entirely computer generated. Alex Roman (the creator) says:
There are a few non-CG elements in the shortfilm: photographer (shot on greenscreen), pigeons, timelapsed growing flowers, flying airplane and sky backgrounds.
But the rest is all CG. You can also watch his compositing breakdown video if you have doubts.
(I’m not embedding here because then it wouldn’t be in HD. Be sure to watch in fullscreen, with sound on.)