Not entirely sure now if I'll be using the Magic Lantern raw capability for my doc. The fact that it's still early alpha and requires a ton of post processing is a bit of a put off. I have been thinking seriously about buying a canon 5d MkIII over a black magic camera. Still waiting a comparison article to appear between the MkIII with ML raw and the 4k version of the Black Magic Cinema Camera.
For the doc though, I'll probably just shoot interviews in 1080 on my 7D. Cheaper/quicker/more reliable. I also think that I've shown on some of my other projects that the 7D can look very pleasing and cinematic when exposed properly. Not as much latitude in post for grading, but as long as I protect highlights and blacks, I'll be fine.