I just watched Matt Grainger's hands-on preview of the S85A, which he tested on his D5. It looks like an amazing--and big--piece of glass.
https://www.youtube.com/watch?v=_J6lFgMBYvc![]()
It is hard to speculate, given his shooting environment, but the lens reminds a bit of the 85 GM both physically and in the images it produced.
For $1200, it is probably a fair value. Comes with the Sigma dock as well.
Will they eventually release this beast in A-mount, given the release of the A99ii?

