We have the 50D with the Magic Lantern software enhancer enabling RAW recording and the Blackmagic Pocket Cinema Camera that comes with RAW recording plus ProRes. (See ProRes compared with RAW here: vimeo.com/79231766).
Interesting test. That scenario is clearly the limit for the 5D: shadows still look fine if you push them up, but it's getting close to the point where they will stop to look fine. Whereas the BMC seems to have a lot more headroom. Pity my lens set is not a good match for that tiny sensor...