All what you've read about this lens is true : it's a fantastic, sharp, fast zoom lens. However, I had a back/front focus issue with my model out of the box (clearly visible at f/1.8). Don't forget that front/back focus is not a lens nor a body issue, but a concern of the combination of a singular body with a singular lens.
In order to fix it, I bought the Sigma USB dock which is very welcome and allow you to have a perfectly calibrated lens.
So if you consider buying this great lens, you should probably consider buying the USB dock as well...
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