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Here is my test I did today.  There are a few notes to be aware of:   1) There is moire evident when set at 0 (roof of the pavilion).  At -5 there is none, although the compression of youtube introduces moire. 2) Excessive sharpening in post is akin to sharpening in-camera by re-introducing moire.  Not only that but it also exacerbates banding as well.  The last shot of the sunset, you can see a sort of "pulsing" wave above the sun.  This is not present in either the 0 or -5 setting, although you can see some banding in the 0 setting. 3) There is a lot of noise at -5, but there's more detail too.  Proper noise reduction will help. 4) Contrast isn't easy to fix.  I made a bunch of other shots, however I wasn't able to match them.   Never forget we're dealing with an 8 bit codec.  You can grade the footage, but only so far.  And trying to fix things in post could result in worse problems.  The banding was especially surprising, and it looks worse in the ProRes version.  I think it best to find the right compromise for the type of shooting you do.  And you have to get your exposure and contrast as close to final version as possible.  The GH3 is better than the GH2, and you have some room to adjust, but it still isn't a whole lot.   http://youtu.be/qxxFe_y-2y4