>>2639418>Canon has EOS-M for the 10 people that bought it, so they do have a system of mirrorless things and an adapter for the EF/EF-S.I've won major awards with photographs taken using the Canon EOS-M. Admittedly, I has L-series lenses on it at the time although I only very recently bought two of the EF-M lenses that are native to the M. It's easy and enjoyable to use and has a similar sensor to the EOS 60D DSLR. The touch-screen is as responsive as the screen on the iPhone. With a good lens (which includes any of the EF-M Lenses) you can capture pretty much anything with the EOS-M and the lag is not quite as bad as people make out. These days the original M sells for around $199 or less.... so it offers excellent imaging ability at the lowest cost.
The native EF-M 11-22mm f/4 STM lens offers a similar focal range to the EF 16-35 f/4L lens with identical image quality. And the 22mm f/2 lens is one of the most versatile pancake lenses available on such a small body.
The EOS-M3 has higher resolution than the earlier M. And the new sensor has a reduced gap between the pixel diodes on the sensor... meaning more light and greater resolution.
Plenty of people bag the EOS-M but without good reason to do so. Those who have bought this camera usually find it a superb backup to their DSLR or it ends up being their favorite camera for day-to-day carry.
I've used hundreds of different cameras over the last two decades and the EOS-M was (and still is) one of the best cameras I've bought. Your next alternative would probably be a Sony. But personally, unless you're looking at the A7R II, you can still take great pics with an alternative like the EOS-M.