Hi, Steve.
This sounds rather like hearsay. If you could post a link to such an analysis we may be able to assess it.
From looking at a couple of reviews of the lens online, nothing jumps out as being bad about it in any body
combo. The worst thing I've read is that it doesn't come with a lens hood, but nothing untoward about
optics and operation.

And that leaves you to try it out. Take pictures and post them here with the Exif camera data intact, and
point out any relevant matter you want us to look at.