What aspects of the 5d are cleaner? My 7d was plagued with moire and aliasing and I find the GH2 much cleaner. How was your GH2 set up? Hacked? ETC mode?
I meant noise. Moire and aliasing, right, but GH2 is noisy in every scenario, day or night. 320 ISO is the threshold before you start to see nasty banding, it is still a rather noisy ISO to work at even with plenty of light.
ETC mode on and off. ETC mode does have more noise, ETC mode off still shows noise even when there's plenty of light. That's part of the charm, though.
I shot part of Superseeds with an unhacked GH2, it was also noisy. Hacked has even more noise but more pleasant than the unhacked GH2, and it doesn't get muddy when you shoot underexposed areas.