Summary: Producto 100% recomendable. Servicio rapido y confiable. Lente de muy buena calidad, buenos acabados. Profundidad de campo decente, nitidez muy buena. Enfoque normal para ser Sigma y no Nikon. Precio y calidad en su justa medida.
Summary: It is better than Canon 50 mm F/1.4 for a crop DSLR, and it is much cheaper than Canon 35 mm F/1.4 L. There might be some mis-focus based on different samples. My first one has a misfocus ~1.5 cm when implanted on my Canon T2i. Then I returned it back and changed it into a new one. The second one is perfect.
Summary: Sure, it's not perfect for pixel peepers, but for the purpose Sigma markets this (it's aimed at folks wanting a fast, widish APS-C prime for indoor kids' parties and soforth) it does a great job. Not as sharp as the Sony 35 1.8, but the extra 2/3 stop is nice to have. And you can use the MF/AF toggle on the camera to swap focus modes, which you can't do with Sony's own low-cost equivalent. Recommended.
If you own a cropped sensor camera, get this lens!
7 March 2013
Summary: I have had this lens for about 2 months at this time of writing my review. This is my first prime lens for my 60D cropped sensor camera and my first non Canon lens. Canon does not make the perfect 1.6 cropped lens. No idea why which is why I was drawn to this lens. This lens has become my walk around lens or the lens that stays on my camera all the time unless I know that I am shooting something specific that requires another lens from my small arsenal.
Summary: Bought this lens last week at amazon for (IMO) an amazing price of $289. It's a great lens for cropped bodies (like my T2i) and an amazing value for the build quality and f1.4 with HSM. The first thing I did was to test for front focusing issues that has been the biggest complaint so far about this lens and am very happy to learn that the copy I got didn't have any of those issues.
UPDATED, FEB 5th 2013 - After comparing lens reviews for over a year, I went with the SIGMA.
Mark Petry, Amazon
18 January 2013
Summary: UPDATED INFORMATION as of 2/5/2013: ------------------------- The review below this update remains the same... but with two additional (important) details. I hope this helps: 1. I did start to experience some autofocus misses in low light after owning the lens for about 2 weeks. Nothing too bad, but worth mentioning. Sometime it front focused, sometimes back focused. It still worked fine 90% of the time. 2.