Ignoring size/weight issues, would I gain anything on my EPM1 (so, no weather sealing really) by moving from the 14-42 to the 12-50. I would love my kit lens to be a little wider (+1 for the 12-50), but the f/stop at max FL is smaller (6.3 is it???). The macro capability is nice. How about sharpness, contrast, distortion etc. etc. Any benefit from the 12-50 over the 14-42?