I foresee the Canon EF-M competing favorably with the Nikon One mount. One major limitation of E-mount is diameter. E-mount is 46.1mm to Canon's 54mm and Nikon

I foresee the Canon EF-M competing favorably with the Nikon One mount. One major limitation of E-mount is diameter. E-mount is 46.1mm to Canon's 54mm and Nikon's 55mm. I think a lot of the other limitations can be fixed, but that one is a bit tough for Sony. That means they will run into issues with vert fast/wide aperture lenses. Nikon goes down to f/0.95 on their 58mm. Nikon seems like the clear winner here.