So I finally pulled my finger out and bought a 10-20mm Sigma f/4-5.6 from B&H. Reputable dealer as always, internationally known brand, 1 year international warranty. Anyway it arrived while I wasn't home to use it and it was about 35 days from date of purchase before I finally was able to try the lens. Well bad lens. It happens. element completely misaligned and even when viewed at 25% you can see very noticable lack of sharpness in the left half of the frame, compared to tac sharp 100% sharpness at the right. No biggie time to call in the claims. B&H Photo video doesn't want the lens back. 30 days since purchase expired and as such they wipe their hands of it, and say contact Sigma for international warranty. Sigma's Oceana service point says the lens was sold not fit for purpose and as such it's B&H's job to replace. I'm angry. I'll let you know how this pans out over the coming week. We'll soon see if this is my last Sigma purchase or last B&H purchase. Right now I'm more angry at Sigma.