I was looking for some fast glass for portraits, etc. I had a budget of about $800 (not enough, I know) and was struggling with the Tokina ($650) and the Sigma 50-150mm 2.8 ($750). I was about to pull the trigger on the Sig and searched around for some more reviews and was hard-pressed to find a critical review on the Tokina. The Sigma was mostly good, but did have some complaints about wide-open performance. Although I won't be doing much at 2.8 in the way of portraits, I was a little concerned about this. I hope I made the right decision. I will update y'all sometime next week!! Does anyone have this lens now?