Any QC issue with this lens?
It's a brand new lens, but I haven't heard of any. I have seen two reviews and they were both very positive. I tried one of these babies out at the local camera store and was quite impressed. The build is really nice (although the zoom ring was very stiff) and the lens was very sharp at all focal lengths I tried with great colors. I even took a little movie clip on a 7D that turned out nice.