At the 27mm and 50mm focal length at f/2.8, neither distortion nor vignetting were noticeable to any extent worth mention.
Stopping the lens down to f/11 showed that the lens was definitely a wise purchase. At all three focal lengths, both the centers and the edges remained quite sharp, with distortion occurring again only at the 17mm focal length.
|27mm f/11 1/125 ISO 200|
|100% crop from center|
|100% crop from upper right corner|
At f/22, the Sigma 17-50mm does seem to lose a bit of resolution, but this is also to be expected to some extent when a lens is stopped all the way down to its smallest aperture. Nonetheless, I was still pleased with the results, though I'm not going to post another image of the wall as it's a little tough to discern this loss of resolution in this subject. You'll just have to take my word for it.
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