Summary: Some people swear by fast prime lenses, such as this one. The big aperture enables fast shutter speeds and ISO is kept lower in low-light situations. However, I actually find the EF-M zooms (18-55mm and 11-22mm) more useful in most situations.
Pros: Small form factor, light, fast accurate AF, great image quality
If you have an EOS-M camera, you should have this lens
29 March 2015
Summary: This lens gets a LOT more light than the 18-55mm lens, it is much easier to take photos in dark environments such as indoors. Not to mention the camera getting into the range of point and shoot size with this lens, I can fit the camera in my pocket!
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.
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.
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.