I have just completed a thorough review of the EOS M and a lot of its components:
http://www.dustinabbott.net/2013/09/canon-eos-m-review/
The review includes an examination of the EF - EF-M adapter and EF lenses on the M, the 90EX Speedlite, and the use of multiple adapters for Legacy Lenses like M42 and Konica mounts. The EF-M 22mm f/2 is only native lens included in the review at the moment, but I will be updating it later this week after the EF-M 18-55mm STM lens arrives.
http://www.dustinabbott.net/2013/09/canon-eos-m-review/
The review includes an examination of the EF - EF-M adapter and EF lenses on the M, the 90EX Speedlite, and the use of multiple adapters for Legacy Lenses like M42 and Konica mounts. The EF-M 22mm f/2 is only native lens included in the review at the moment, but I will be updating it later this week after the EF-M 18-55mm STM lens arrives.