The GH2 is insanely sharp; almost too sharp sometimes. One flaw with the software is that the profile settings don't have much of an impact on the image, so turning sharpness down all the way has a subtle effect at best. This is one reason why vintage (optically imperfect) glass is such a magical combination with it. And for other unknown reasons, Canon FD and Nikon glass somehow spits out amazing images with the m4/3 format.
"soft glass" on an unhacked GH2: