So you have used a GH3 recently? Are you so sure that you cannot shoot something that is not lit?
I think it's amazing how people defend a "brand" as if it was their first born....... Mark III is a $3000 pro camera, GH2/3 cost $500-$1300 Consumer/Prosumer cams.... As a Director of Photography there is simply no denying such an amazing tool and what it has to offer. This thread will never end, but just for comparison look how the GH3 looks compared to Mark III, options people I believe that's what allows one to grow.....
Like he said the aperture were the same on both camera and so with full frame camera compared to GH3, it doesn't have the same dof, one good example is the 2nd scenes, the M3 were clearly very sharp on the chain of the swing, but the background is soft because of the shallower dof, the GH3 looks sharper all the way so it seems like it is a sharper camera, but if you just comparing the chain on the swing set they look the same.