Not really what I'd call enough to sell and upgrade to my 120-300mm f2.8 OS works fine so I've no need to get the dock version one (far as I know it and a few others got an upgrade that was mostly just the dock) - but if buying new worth considering going for the dock version. Almost no cost to them and no hassle for the customer. The dock system means that they can fix ALL their released lenses in a very quick firmwire update. This dock is only compatible with the Sigma Art, Contemporary, and Sports line lenses featuring a Pentax K lens mount. Exclusive SIGMA Optimization Pro software makes customization easy. The Sigma USB Dock allows you to connect your Sigma Global Vision lenses to your computer in order to update firmware and adjust focus setting parameters using the Sigma Optimization Pro software. In the past Sigma had to then re-chip lenses an expensive option for all involved and time-limited because they could only keep stocking and fitting chips for so long. By connecting a SIGMA Art, Contemporary, or Sports lens to a computer with the SIGMA USB DOCK, photographers can update the lens firmware and adjust focus position and other parameters. Sigma reverse engineers their control setup so sometimes the big companies change enough that it breaks (you can actually see this because sometimes the camera thinks its got a Canon lens of a specific type attached even when its a sigma lens). Sigma doesn't have official codes for Nikon nor Canon - so every time either of those companies releases a new camera body there is a chance that changes in the lens to camera communication setup can result in some/all Sigma lenses not working on that body.
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