If you use an EOS-M for still photography, you need this lens.
1 March 2015
Summary: The lens is compact, super fast, and amazingly sharp, as others have pointed out. The color rendition is wonderful. The only thing i dislike about it is that the autofocus motor is fairly loud. This noise records when shooting video, so the lens is not suitable for videography unless you are recording audio off-camera (and i mean entirely off-camera--a hotshoe-mounted recorder will still pick up the noise), or if you have no need to pull focus.
Summary: This is the third of the EF-M 22mm F2 STM Compacts I've bought and I agree with an earlier reviewer who described this as the lens Canon "should" have sold as the standard on their short-lived, but very nice EOS-M cameras. I've bought the EOS-Ms up as they've become available because for shooting video they're tiny, their chipset shoots great HD video, and their sound is actually superior to the 7D (sound was considerably improved in the 7DMkII).
Summary: truly an amazing lens (especially given the price) - i'm constantly surprised by the sharpness. the size is not quite pancake however it makes the eos-m almost pocketable. i went to europe for the holidays and used this with the eos-m exclusively. i love canon colors and this glass on the eos-m delivers. word of warning, however - it's not an active AF/MF lens like the USM lenses you might be used to. focusing manually with this lens is very strange.
Summary: very sharp - fixed prime so you zoom with your feet - nice inexpensive quiet compact lens - what's not to like? *** revision *** Reading some of the reviews I think there are a few things that might be said to help others make a decision on this lens like, 1.) They are White Box Lenses i.e.
Summary: I thought the standard 18-55mm was decent for the EOS M but wow this thing is an absolute beast. It is super compact and very sharp. I am far from a photographer but this made taking pictures a lot more fun.