Any comments on this versus the Canon 40mm F/2.8?
I owned the 40 but on full-frame. Wonderful lens. I wasn't a believer at first but the sharpness is pretty stunning even wide open. AF isn't the fastest but I took it on vacation as my main lens and did not have a single shot out of focus, which is a first for me.
That being said I wouldn't buy the 40 for a crop body because it would be an odd focal length. The 30 would be a much better. Downsides would be softer images and out-of-focus shots from time to time, but on the upside, being able to let in 4x as much light and better bokeh.