Nice. Congrats on your 5D3 purchase 
Appreciate if you could answer couple of my questions.
did you use Glidecam with vest support or was it just 4000 Pro? some of the shots are really smooth.
what is your take on Samyang/Rokinon 14mm (my usage will be 70% video and 30% photo).
Txs
Sorry for the late reply, I have been in Italy for a week.
I just used the Glidecam.
As for the lense. I really love the look of the 14mm. The samyang was incredibly cheap (299€ compared to the Canon L 14mm with 2400€) It is just as you say. I am using it for video way more often then for photography, because the wide angle looks way better in motion than in a picture.
One of the great flaws is that you can't attach filters to the lense
