[JJ_SO]

If I'm not mistaken, it's the same AF unit as it's working in D7000. And although 8000-12000 ISO are high numbers, in your photographs there's plenty of light and surely enough to focus fast. Troubles are starting in low light (not in stage light conditions). But I don't want to talk your decision bad - at least, each camera will have an AF problem beneath a certain amount of light.

 

So, have fun with your new one.