I have the Tamron on the D7100 and am a happy bunny! Great combination and yes I get sharp results at 600mm when stopping down to F8-11, AF is bang on, my only critcism is the onion ring specular highlights in sparkling water.
Would have liked the sports but it was the extra weight!
Looking forward to see how you found it.
BTW. I'm on the second copy, the first was decentered!
It looks very good.
Klaus, did you take these pictures without tripod?
I am not sure how pleasant is to use this lens on the field, but the results impresive.