I want to share my experience with GH3 as a photography tool.
Coming from a canon prosumer series, I was very disappointed with the GH3. The midtones are flat, so you end up with pasty saturated complexions on people's faces. At least in Adobe Camera Raw.
So I bit the bullet and bought PS Kiss' GH3 lens profiles which lets me force different camera profiles that are calibrated for the GH3. And when I apply the 5D Mark 3 profile and bump the exposure by 1/3 stop, the image quality is superb. Whereas the standard Adobe Camera Raw profile that which is your only option in Adobe Camera Raw, for my standards, makes unusable pictures when it comes to pictures with people's faces being the subject.
So the problem is that Panasonic is not working with Adobe to create calibrated lens profiles, not that the camera is not capable. But you can work around it for now. It's just one extra step in the workflow. Sure the raw files in MFT cameras are supposed to magically work in Adobe camera raw, but they only fix distortion. Colors, which may be fine for people looking for a different color profile than what you normally get from Nikon or Canon, but are not good when you are looking for accurate color.
With that said, I feel good about shooting photos with the GH3 now that I know how to get the most out of it.