Holy shit, Simon. That is soooo awesome.
I also did a few tests:
In this first one the video camera is a similar crop to a 7D.
The images in this comparison were on a 5Dmk3 with a 1.4 so you can get a similar crop on your 7D: http://nad-lembeh.co...-vs-mpe-65.html
Tomorrow i'm hoping to get the TC on the crop for crazy macro