Amazon link here
http://www.amazon.com/Sigma-Aspherical-Pentax-Samsung-Cameras/dp/B0000501T1
Its a fairly hard lens to come by and is pretty much a clone of the Canon 14mm 2.8, which is quite a bit more expensive. I have used both and opted to buy the sigma because the Canons Corners are much softer in my opinion and Could not justify the 2400 price tag, when the sigma was a fraction of the price and extremely comparable. It was discontinued in 2007, but some dead stock still remains. I was looking to get $600 for it, I do not need to sell it but if someone is interested let me know.
Here is a brief overview
http://slrlensreview.com/web/reviews/sigma/sigma-wide-angle/148-sigma-14mm-f28-ex-asph-hsm-lens-review
Sample Photo
