I did so much research when ready to buy this lens. I do landscape and wanted something a bit wide and fast. Canon 24-70mm 2.8 was out of my price range. I was surprised to find so many great reviews on the Sigma 17-50. I am very happy with this lens. it is fast and sharp. The only little thing I don't care about is the weight.. IT IS A HEAVY BEAST. but I love it. Anyone else have this lens?