We took a brand new GH3, a Hacked GH2 running Nick Driftwood's Intravenus patch, and put them head-to-head against a Blackmagic Design Cinema Camera and a 5DMKIII in high contrast situations to see if the two Panasonic cams could hang with their $3000+ brethren. The results surprised us.
Here's a teaser from the shoot. [download the 1080p Mp4 to avoid vimeo compression errors]
Keep in mind, they've been graded to look similar, but in their "raw" state there are very distinct differences. You'll also see 3 other tests where we found that 2 of the cams can see in the dark - one of them as well, if not better, than the human eye.
Results show vimeo.com/56362977