new Sigma 120-300 f/2.8 again? But now with weather sealing for sports?

I am totally for Sigma on this one. This lens is unique, Canon does not have anything comparable. Quality is great even with the 2x TC. Having purchased it recently, I asked the store if upgrade is possible. They talked to Sigma on my behalf and Sigma agreed to take back my lens and give me the new version if I don't mind the difference in price. How's that for customer support?

lordofthelens.co.nz