Anyone else used one?
I ended up replacing my nifty fifty with it. The 50mm broken when my camera came off my tripod in the kitchen. The soft plastic casing probably helped cushion the blow and protect the camera body. Took me a while to decide to replace it, and opted for the 40mm as a smaller, lightweight lens.
I actually find that 40mm seems to be more 1:1 through the viewfinder than the 50mm was on the 7D.
Image quality I think is also pretty good. The electronic manual focusing is a bit weird though. Even though the lens isn't a macro lens by any means, trying to do minute manual adjustments can be tricky. I've found autofocus struggles a bit more than other lenses when trying to focus on things that are either very small in the frame or have something in front. Eg, a blade of grass often results in the camera focusing on the background, even with pinpoint focusing enabled.
All that said though, I'm happy with the results. The size and tiny weight of the lens makes it feasable to carry around the 7D+40mm in my bag now.
Sample shots yesterday evening, conditions weren't quite ideal as the garden was mostly in shade by this point and it was pretty windy.
Rhododendron flower bud by
Chris_Moody, on Flickr
Tulip flower by
Chris_Moody, on Flickr
Rhododendron flowers by
Chris_Moody, on Flickr
This one taken at work to ID the species.
IMG_3648 by
Chris_Moody, on Flickr