It might indeed be the case that some color profiles are not correct. I have noticed for example, that for some cameras (Canon 1DMK3, Leica M9) there is a noticeable shift in White Balance in comparison to other color profiles.
You could try to calibrate a profile for the G9 based on this studio picture by Dpreview. It might not be the best image, as sometimes there studio scene becomes a bit old and the colors of their color checker might have faded, but maybe it is good enough.