I run the same lens on my Nikon D810 full frame and haven't noticed distortion to any major degree. Being half blind probably helps me enjoy my images more. Though if I'm using it it's usually the Milky Way and I'm stacking and stitching groups so maybe distortion on edges are overwritten with more central frames of the same area. I have no way of confirming this, see comment about half blind (not blind as such just lousy eyesight).
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