(Shot at ISO 102,400)
http://mitaimon.cocolog-nifty.com/blog/2012/03/eos-5dm3-01.html
(in Japanese)
Samples are small sized and with no EXIF. The lens used is told to be EF 70-200/4L IS, handheld.
Btw, this tells us how strong the 5D3 would be at high ISO. IMO, that ISO6400 image is completely "usable", at least at web size.