Picked up a new Tamron 90mm, the latest model, a generation 2 - but technically the 3rd version. The new stabilization is incredible, but second to the lightning fast focus. This lens does not hunt, it just seems to know where to go. Optical quality is better, it's really great. Compared to the first generation, never used the second model, it is a clear step up, but the first one was still really good. Here are some shots I did today on my D500 paired with the Tamron 90mm.
The lens does seem to underexpose by a 1/3 to 1/2 a stop - easily compensated for.