Let me pick your brains. I am looking at the EP1 and GF1 in a shop today. No matter which one I went with, I would want the fast 20mm pan lens. When this lens is mounted to the EP1 with the IS, does it gain 2 more stops(making it equal to 1.2) due to the in body IS? My concern is for indoor shooting in natural light. Also, is the image IQ equal on both these cameras? I don't care about color because I shoot raw and do my own post processing.