The Japanese call mirrorless "systems cameras," meaning that it's not just a camera model or two, but a full-fledged range of choices and options that are extendable. Frankly, we're a long way from the "system" that Nikon used to produce with their film SLRs back in the 1970's through 1990's. We still have a ways to go to hit the reduced system set of the Canon and Nikon DSLRs of the 2000's and 2010's.
Thus, it's worth looking at exactly where the various systems are, in a few different ways. This section contains articles that call out differences between different manufacturer's options:
