GM1_8804 1.2 Crop 50mm
This shot was taken at 50mm wide open in 1.2 Crop mode. This picture here was the result after applying Lens Correction and CA removal in lightroom 5.7. I was very surprised to see practically all of the vignetting gone! If you look closely there are light touches in the corners but not any worse than some other native full frame lenses in my opinion!