Summary: This lens is the best purchase I've made in a long time. Worth every penny. Making the transition from kit lenses to this has made a world of difference in my photography. This has not come off my camera body since it arrived and I couldn't be happier with the difference it's made in my images. Wonderful, shallow depth of field for lovely portraits, also fabulous for low-light situations.
Summary: Good lens and a great lens for the money. It's sharp at 1.8 and gets great by 2.4. It does have a plastic mount, but is feels really solid. I think it outshines the FA1.4 50mm because that lens tends to be soft until 2.8. This lens is cheaper too.
Summary: Excellent crisp images, fast focusing, great for indoors and outdoors alike. Yes, the autofocus is a bit on the loudish side but this is a quality lens and the price point is excellent. I was looking into the 1.4 aperture lens (2x more expensive) and grabbed this one instead. Couldn't be happier.