I considered it, looked at it online, the Fuji X-Pro, and the Nikon Df. Most of my lenses are either in Leica Mount or F-Mount. A good number in Retina Deckel mount. I can use those with an F-Mount adapter. With the EP2 and EVF-2, you need to stop the lens down to shooting aperture. The finder can get "noisy" at F5.6~F8, and it is hard for me to nail the focus when stopped down. The XPRO-1, eliminated as it needs to be replaced with a model that has the on-chip phase detection AF, like the lower-priced models. The Nikon Df- focus was fast and easy with the Vivitar 135/2.3, that did it for me.
The Sony- I would go for the A7, everything that I've read indicates that it is quieter, and 24MPixels is plenty. I will be interested to read about the A7r experience. The Df- high-ISO is amazing. The M Monochrom is amazing, as the High-ISO performance is native to the sensor. But the Df is amazing.