So I spent quite a while debating between the 80D and the M5. I wanted an everyday camera, but it had to fill the niche of crop-sensor complement for airshows to my 5D III. I was really disappointed in the AF performance of the M3 but loved the IQ and wanted to give it another shot
Long story short, I bought the M5 on a whim because of a cashback sale and I think it might be the best camera I've ever owned. The C-AF is so much better than the reviewers make it out to be, it's at worst usable for relatively predictably moving targets and the burst rate and buffer both at least good enough. The ergonomics are absolutely perfect and I actually find the EF-S lenses to balance almost perfectly.
Only two things that really bug me are 1. the stupid EVF/screen transition functionality. It's not as smooth as it needs to be and 2. if the G5X can handle a fully articulated screen, so can a $1,000 mirrorless camera
I'm so glad I got this instead of the 80D and I'm pumped to start sharing images off it. Now if only Canon would release some real EF-M glass that doesn't cost a fortune... or let Sigma and Tamron do it for them