I recently presented some crops taken with the Voigtlander 17.5mm f/0.95 Nokton and Olympus 17mm f/1.8. By comparison, the Olympus corners appeared rather soft, and in the comments that followed, I alluded to the fact that much of this softness was a result of the way Lightroom applies barrel distortion correction automatically. A lot of edge sharpness is lost as a result of this distortion correction, and unfortunately Lightroom doesn't allow you to disable the correction. The same is true for nearly all Micro 4/3 wide angle lenses, the Voigtlander 17.5mm f/0.95 being an exception to the rule. To demonstrate this issue, here is a resized f/5 handheld snap taken with the E-PM2 and Olympus 17mm f/1.8 lens at f/5: Below is the center 100% crop as default processed by Lightroom 5.3 (left), Capture One Pro 7.1.5 (middle), and Capture One Pro 7.1.5 with distortion correction disabled (right). As you can see, the colors are different, Capture One (C1) corrects chromatic aberration automatically by default, and C1 also boosts local contrast and does some more noise reduction by default. The apparent level of detail is similar, however: Moving to the extreme bottom left corner is another story. Again the color and contrast differences are clear, but the crop processed by C1 without distortion correction (far right) has noticeably greater detail than the other two: The same is true in the extreme bottom left corner: The extreme upper left corner is a bit outside of the depth of field for this shot, but still the distortion correction has sacrificed a noticeable amount of detail: The point here is that corner sharpness is significantly better without distortion correction. Not all images need complete correction of distortion, and by doing less correction (again, Lightroom doesn't allow this), you can preserve more detail. Even when complete correction of distortion is desirable, I find that I can get the best results by processing from RAW without distortion correction in C1, doing the distortion correction using PTLens, and then sharpening to taste in Photoshop.