Hi Andrew,
I enjoy reading your reviews, however I am wondering if it is fair comparing a camera with a stock firmware vs a heavily hacked one. (If I read correctly, you are running a hacked GH2 firmware which is probably not supported by Panasonic)
If that were true, this is actually not a case of Gh2 vs 5D3. It is a case of Hackers vs Canon Firmware Engineers.
In this match up, I must say Hackers 1 : Canon Engineers 0.
If these hackers can do so much with the GH2, I wonder what magic can they do with a 5D3.... Or a D800 for that matter.