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I've been well pleased with mine, but i wouldn't recommend it on any camera that doesn't have a big bright viewfinder and a sensitive focus screen. Also, i needed to get shims for my EE-S screen (on 5D) and spend an afternoon calibrating the focus screen to solve a general front focusing problem.
Note that there is no electronic aperture linkage on these, so you need to do stop down metering - i.e. you need to focus at whatever aperture you are going to shoot at, or focus wide open then manually stop down and shoot.
Much as i like mine, i have to be honest and say i don't think it would make a great lens for professional wedding work because of the slow handling. For studio-based portraits maybe it would be better, but it has a minimum focus distance of about 1m, which limits close-up shooting (full frame head shots etc).