Summary: Sigma has finally delivered an important lens which has been missing from the Pentax lineup for almost a decade: the new 85mm F1.4 EX HSM. Before its release, Pentax owners had to rely on the legacy FA* 85mm F1.4 , or its slightly slower and shorter cousin, the FA 77mm F1.8 Limited . This is exciting news, as the Sigma delivers all the latest technologies for less than the price of a used FA* lens, and makes no sacrifices in optical quality.
Excerpt: The Sigma 85mm f/1.4 EX DG HSM Lens hit the streets with great anticipation and generated many requests for a full review. Reasons for the interest? First, the 85mm focal length is very useful - especially for portraits. Second, the f/1.4 aperture is very wide - allowing 16x as much light into the camera as many consumer zooms at their f/5.6 max 85mm apertures (2x as much light for each stop times 4 stops) with the ability to create a strongly-blurred background.