Panasonic LUMIX G 20mm f1.7 and 20mm f1.7 II ASPH lens reviews: Has Panasonic improved its classic standard prime?By Kevin Carter - Thursday November 07 2013 Lens Review
With an overall DxOMark lens score of 20 points on the E-M5, the revamped lens achieves a very good score overall. Sharpness is high for a bright lens such as this and chromatic aberration is low. On the flipside, sharpness across the field isn’t particularly consistent and both distortion and vignetting are high. Panasonic cameras remove vignetting, CA and correct distortion on both out of-camera JPEGs and in RAW files with certain software, however the price for this convenience is a slight loss of sharpness in the final image. Olympus MFT cameras perform slightly differently to their rivals from Panasonic. They automatically remove distortion and vignetting but correction for lateral chromatic aberration is a new feature to the top-of-the-range OM-D E-M1.