Mbell - I know you are obviously a Canon loyalist, but lets be real. Panasonic, Olympus, Sony all had mirrorless for years before Canon gave it their first attempt. As a Canon user of over 30 years, I have absolutely been faithful to Canon. But in recent years what they thought was important and what the market has ben moving towards are two different things. Canon has been hanging in there on their legacy, not their innovation. Canon's own started sensor patent application came months after Sony's Patent for a Multilayer Stacked CMOS Sensor. In fact Sony announced its first patented stacked sensor back in 2012.... a long time before Canon's first.
Canon's "system" is a great system. But at the individual component level, they are lacking right now. This doesn't mean you can't capture great images from them - heck a good photographer can capture great image with their phone. Canon simply is failing to innovate - they simply evolve.
The problem is Canon is a couple of generations behind both Sony and Nikon on sensor technology. Those difference don't make a huge difference in the end product, but they do change how one shoots. In the end though, it is the end product that makes a difference - the image. And all can produce fantastic images.