It's too early to tell if the just-announced EOS M5 is Canon's first truly serious mirrorless ILC, but my first impression after going hands on with it (while tethered!) at PhotoPlus Expo 2016 is positive -- in spite of the facts that it has no 4K and a pretty dumb selfie position for the rear LCD panel which rotates below the camera, eliminating the possibility of using a tripod:
Part of me simply wants it to be a good camera at a good price because I used Canons for decades before leaving the fold for Sony, and I have both a heart-felt fondness for the brand -- and competition is a good thing.
The good news is that it uses the same sensor as the one found in the Canon 80D; it has an EVF; it looks like it has very good physical controls; and the software (menu system) just might be more usable than Sony's.
We'll see how I feel once I go hands-on for an extended review.