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Of course. The f/2.8 was made for high speed focusing. Its design was actually by Minolta and replaced their 80-200 hs g, which may be faster, but with exponentially more noise. The f/4,for all intents and purposes, is a shrunk down version of the f/2.8. But if you can, find reviews or even rent one with the a6000. Its an excellent combo. Moreover,while af-c is a bit behind with Sony, the face detect af-c is ahead. For sports, as long as a face can be tracked, it does a great job. Could be an issue with things like soccer. However, Sony is making big strides. The a-mount a77ii does a great job. It will only get better as the techs converge.