I've always considered Oly zooms on Oly bodies because of the lack of ability to use the OIS and (usually) added cost and weight of the Panasonic lenses. But now that I have an E-PM2 which can use the OIS on the Panasonic zooms I'm considering otherwise. From a specs perspective the Panasonic is physically smaller, a wee bit heavier, and offers OIS. The Olympus is cheaper, lighter, and a little bit longer physically. I'm amazed how few comparisons I've seen around here actually comparing the two. I'm considering the Panasonic because of the better build and I have the notion (I could be wrong) that the OIS might perform better than the IBIS in the E-PM2 which doesn't seem as effective as the VR on my Nikon glass. Considering -Stabilization on an E-PM2, OIS v, IBIS -Image quality -AF Speed Which do you guys feel would be a better performer? Any strengths/weaknesses in image quality comparisons throughout the zoom range? I'd like to hear some opinions.