DxOMark review for the Panasonic Lumix DMC GH2
18 million pixels on a similar size means a smaller pixel pitch...But on the other hand, it might also not be such an improvement for shooting still pictures especially if resolution is not a priority. 18 megapixels on a 17,3 x 13 mm sensor results in a very small pixel pitch: only 3.6 µm on the GH2. This is really small compared to the 4.3 µm of the GH1 or to the 5 µm of a Sony NEX 5, and might impact image quality.Image quality: no better then the GH1Look at the test results in detail, compared