Summary: Let me start by saying I own all three of Sigma's f/2.8 Art lenses for my Sony e-mount camera (19mm, 30mm, and 60mm), and this is the only one that regularly disappoints. I don't know what it is about this lens. Manual focus (with focus peaking ON) always yields a softer-than desired image.
Summary: It's a nice lens and takes decent pictures but the actual lens is tiny and doesn't allow the full benefit of Sony's CMOS sensors. I usually use my A6000 with gorgeous old Olympus lenses and this one seemed a little disappointing.
Great lens, questionable compatibility (using a NEX 5r)
27 September 2014
Summary: Pros: This is a very good lens, especially for the price. It's sharper than the kit lens, even at f2.8 compared to f4, but honestly for me, it's not really a very significant difference unless you start pixel peeping.
Excerpt: Image quality on the Sigma 30mm f2.8 is nice for a lens in this price range. Looks great and is compact. However, there is no manual/auto focus switch on the outside, which means you can only switch between the two in-camera.
Pros: Easily Interchangeable, Lightweight, Nice image, Strong Construction
way better than the kit lens that came with my camera
25 July 2014
Summary: I'm mixed about this lens. The colors it captures are vibrant and when in focus it's fairly sharp; way, way better than the kit lens that came with my camera. Unfortunately on my Panasonic DMC-G5, the auto-focus is pretty terrible.
Summary: I own the newer, silver version of this lens. I run it primarily on a Sony Alpha A6000. By now everyone knows the good... it is a good value, prime lens for your e-mount Sony body. For the price, you will have to go with an older adapted manual for anything sharper. For what it is, it is wonderful.
Summary: Ordered this in advance of a convention I wanted to document, got the lens in, initial tests seemed ok. But when I got to the convention, within the first day just shooting some portraits the focusing motor malfunctioned, and then the lens completely bricked.