Hi guys, first of all, I love taking landscape and plan to get a UWA for my Canon 600D. I have been considering this 2 lenses after reading reviews for UWA lens. Seems that the canon one is more popular around here, seen a lot of pics taken with it and a saw quite a lot in canon B&S section as well. So far not much people mention about the sigma ones. Any feedback on this sigma 8-16mm? Pic quality likes, built wise is pretty good mention in review but too bad can't use filter. Just need a tiny bit of 2 cent by anyone who used this sigma before, feedback will be gladly appreciated.