Summary: I bought this lens for my Sony A65. I own the SAL 35 and 85mm lenses which are cheap lenses and I wanted one lens that was of higher quality. Given the 1.5 crop factor I figured I would push a little more money into this as my portrait lens. After getting it and manually focusing on points at 1.4 I was impressed with the files, sharp with good bokeh and nothing crazy at the corners.
Summary: I would strongly recommend it if you have a full frame camera like alpha 99. As you know 50mm you multiply with 1.6 for not full frame camera then your lens becomes 50 x 1.6 = 80mm - while on full frame 50mm remains as 50 mm. You need to keep a bit larger distance from the object. For Alpha 55 - like mine it is a good camera, but I would suggest you get a 24mm lens of sony.
Summary: This is a very good lens, so light and compact very handy when I'm just going out for a walk or mall or when hanging out with friends and families. Build quality is great, not perfect but really really good. There is a slight noise when you focus but you'll basically hear it inside a quiet room, when you shoot outside you barely notice it. Even though I know that there is a newer version will come up the Zeiss 1.4 SSM I still bought this, why?
Summary: I just bought this lens off of here a few weeks ago and have to say I am exceptionally impressed with the sharpness, bokeh and overall optical quality this lens has. I've been using a 5 year old Alpha A100 for five years with the kit lens and thought the pictures I've been taking where good until I got my hands on this. I now get why people invest in quality optics and prefer lenses over powerful cameras if you must decide on one or the other.