Summary: This is a great lens and costs a great deal less than others similar to it. Let's do the "not so great" first and get that out of the way. It isn't the fastest lens around and it has been around a while and could use an update...OK, that does it for the negative in my experience.
Excerpt: The copy of lens I received has severe backfocus issue. -20 micro AF adjustmen on my NEX-5N. Other than that, this is a great value lens, which provide super sharp centre at f2.0 and corners come as close to the centre sharpness at f4.0. It provides a silky smooth bokeh at f1.4 to f2.0.
Pros: Durable, Lightweight, Nice Bokeh, Strong Construction
Summary: Plusses on this lens: very fast, nice workable focal length, small and light, good build. Minuses: lack of sharpness wide open, bokeh only so-so. Sony has made a great lens for the money with the 50mm 1.4. Stop it up to 2.0 and you get great sharpness and contrast across the frame.
Summary: This lens is perfect for portrait photos. Combined with the HVL-F43AM flash it produces close to perfect images with the Sony A850 body. The low apature f/1.4 allows you to focus on the object and blur the background.
Excerpt: The product works very well, there are some issues with autofocusing on similarly contrasted object but most of the time it works well. I love the 1.4 which gives great DOF work. The product seems cheaply made but i have no problems with it and love shooting with it.