Can you do the tests in all video modes? (I'm interested in 5x zoom, 1080p and 720p - does the 6D have other video modes?) I guess you should get a ratio closer to 3 if you compare 1080p with 5x zoom (which is also a 1:1 crop).

Tip: turn off global draw to get clean screenshots in LiveView.

Got the numbers for 5xzoom mode on

**canon 6d**will do 720 mode soon, couldn't find a good spot with HDR, very cloudy over here

(got not so nice RAW-DIAG graphs, dots in graphs where not nice linear, random dots in highlights)

Full Well Capacity Dyn.Range Full Well Capacity Dyn.Range Full Well Capacity Dyn.Range

ISO Photo mode Video Mode(1080p) Video Mode(5xzoom)

100 79546e 11,48EV 274301e 11,84EV 97890e 11,78EV

200 42220e 11,49EV 142616e 11,82EV 48335e 11,72EV

400 20643e 11,28EV 75858e 11,75EV 25171e 11,59EV

800 10482e 11,00EV 39219e 11,62EV 12958e 11,29EV

1600 5215e 10,55EV 19868e 11,38EV 6508e 10,85EV

3200 2568e 9,87EV 10092e 10,95EV 3354e 10,25EV

6400 1271e 9,11EV 4931e 10,47EV 1663e 9,65EV

12800 556e 8,04EV 2408e 9,44EV 831e 8,51EV

25600 371e 7,10EV X X X X

Full well capacity of 1080p divided by 5x zoom results in the following numbers (looks like 3 pixels are binned)

ISO - 1080p/5xzoom

100 - 2,8

200 - 3,0

400 - 3,0

800 - 3,0

1600 - 3,1

3200 - 3,0

6400 - 3,0

12800 - 2,9

Will try to find a good HDR spot for 720 mode