Not exactly flaws, but rather features: the lens has quite noticeable distortion, vignettes quite strongly on the full frame. Sometimes this is good for the picture, sometimes it gets in the way. On an open aperture, it has a very beautiful pattern in the blur zone, on a covered circle from point sources they turn into heptahedrons. Resolution, contrast, color reproduction are good. In total, an excellent staffer for a full frame, both on film and on digital. Not suitable for everyone on a crop because of the not always convenient focal length. Due to the tendency to catch hares, a good solution would be to immediately buy a lens hood along with the lens.
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