Upload & Sell: Off
I got the OS version, gave it back because of a strong front-focusing at the far end that Sigma didn't fix.
Got the 80-400 VR Nikon. Very happy, but I loved the Sigma and its bokeh.
Got the Sigma Sport version and I am super happy. Sold the 80-400VR.
If you have to buy one, buy the Sport version. It's definitely a very big improvement over the older ones for a lot of things, build quality and focusing especially.
The focus is FAST and even with the 2X TC it doesn't slow down that much.
Overall a fantastic lens, super versatility with 1.4 and 2.0 teleconverters, very sharp with and without the 1.4 and sharp with the 2.0.
Custom controls with the USB docks let's you program the buttons so you can switch between focusing speed or accuracy, and it works.
Definitely another Sigma winner.