Yeh.
-2 in camera sharpening is what most people use on the GH2 to get less video like and more filmic look, but that doesn't smooth the picture enough to need sharpening in post. If your Gh2 picture is not sharp is not due to that in camera setting.
Applying Sharpening in post is quite complicated. NeatVideo can do it very well, but you must have a good monitor, good eye and make many tests.
rafael
http://www.nagavideo.com