Focusing speed is easily 5x faster than the Tamron 24-70 2.8 I usually shoot with. It stays clean to the brim as expected. When shooting at an airshow, focus speed was of paramount importance. I missed a few shots a year ago with other lenses that didn't focus as quickly. It was in the time it took me to notice lens blur, focus flat and then just hold to zoom in. I paired it with the D750 case. It's not the best lens to walk around with, though, as it's telephoto and everything if you're looking for a sport lens or a long-distance portrait option. This lens is worth the money.
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