The new M.Zuiko Digital Pro zoom achieves a DxOMark lens score of 19 points on the 16-Mpix OM-D E-M5, putting ahead of every other MFT zoom available with the exception of the Panasonic 12-35mm. It has good overall sharpness, and vignetting and chromatic aberration are both well controlled in a lens like this. However, distortion is higher than expected over the 12mm to 18mm focal lengths.