Summary: I got this lens a little over a year ago and really liked it. At the time I was upgrading from an 18-55 so when I saw the capacity of the f/2 I fell in love with the lens. It works really well and I use it just as often as my 24-105 L lens on photo shoots. Unfortunately, the focusing ring began to stick after about 11 months and I was forced to send it in eventually, a very inconvenient process.
Summary: I bought this lens a couple of months ago, and REALLY enjoyed it for about 2 months. The pictures were great, the bokeh effect was perfect and just what I needed. Sadly, the joy didnt last long. I had my camera with my 35mm lens inside my lowepro case and it fell from my knees (i was sitting in a rest), it wasn't a hard fall or anything but my lens was stuck and would not focus.
Summary: Another nearly $400 lens with all plastic construction, plastic internal gears and poor ergonomics (specifically the manual/auto focus switch is difficult to operate and find as it is flush with the lens body). Optically the lens is extremely prone to flare and has very poor corner sharpness when at it's largest aperture (on full frame sensor).
Summary: The files generated with this 35 mm lens were not sharp from 2.0 to 3.2 and relied heavily in the back up of flash in order to render a usable file. Cropping made from the full resolution files rendered images with poor contrast requiring of considerable fine tuning in Lightroom. I would not recommend this lens for professional work.
Summary: The Chromatic Aberration (purple fringing on bright objects) with this lens is just awful. Stop your lens down to f2 and take a photo of a brightly lit chrome faucet. Look closer. See it? Try stopping down to f5.6 or even f11. Sure it gets a little better, but it's still there. This lens is frustrating! I'm selling mine!
Summary: I am sorry to say after reading all the information and good responses on this item, I did order it. Yes, I loved the price! However, I had nothing but problems. It simply did not take good quality pictures and they certainly were not sharp as some others had posted. Maybe it needed to be calibrated but I don't want to go through the send it back and hope. On the plus side, I was extremely impressed with Amazon and the seller for their easy, no hassle return.
Summary: I purchased this lens mostly because I shoot a 1.6 crop sensor and the 50mm on that crop is a bit too telephoto for most indoor situations. I didn't have the cash to shell out for the L-series version of this lens, but figured the f/2 would be fast enough for me. It is fast enough when the light is good, but this lens really struggles in low-light situations.
Summary: I really wanted this lens - after looking at all the alternatives up to a couple of hundred quid more. Wanted it more for video work on my 550d because of the low light capability. It arrived well packaged and on time. The lens was very tight to attach my 550d body. My other lens'(50mm 1.8, 18-55is and a Tamron 55 to 200mm) all fit snugly. But this felt too tight. And the locking mechanism that allows you to release the lens didn't always 'connect'.