I've had the chance to take a look at the lens, but couldn't take any photos with it. It seems to be a very intriguing lens - as far as I know, Sigma (and most other 3rd party makers) has the tendency to enter the market with lenses which have a good price-performance ratio as compared to the expensive (yet usually better) original brand lenses. Now we have the Sigma 50mm f/1.4 - more than double the price of the Nikon, and around USD100 more than the Canon. The lens is quite big, and has a filter size of 77mm which might indicate a professional grade lens. What I'm wondering about is what makes Sigma so confident to price the lens the way they do. Did anybody have a chance to play with one, or to read or watch a review of one? Any other opinions?