The Sigma 50mm F/1.4 EX DG HSM lens was introduced a couple of years ago, along with a lot of media hype. Sigma went all out and produced a fast standard prime lens which is optimized for center sharpness at F/1.4, (in my opinion) and it delivers the goods, as it is amazingly sharp in the centers at F/1.4, especially when used on a full frame camera. This lens is big, heavy and expensive, much more so than other equivalent makes and models, including the Sony 50mm F/1.4. If you want to see some comparisons between these two lenses, scroll down to the “bonus section” at the
bottom of the review page.
APS-C and landscape shooters be sure and read the conclusion, as I have some alternatives for you.