Sony: Excellent sensors, good viewfinders, jumble of junk menus, clunky cameras, oddly-unbalanced lens portfolio, variable quality control.
Fuji: Weird and difficult to process sensor raw data, (X-Ti) good to excellent viewfinder, decent body, weird but mostly useable menus, excellent lenses, above average build consistency.
The 'clunky camera' part of the Sonys kills them for me. The weird Fuji sensor data kills them for me. I own neither at this time.
IMO, the Micro-FourThirds system (combination of Olympus and Panasonic bodies/lenses plus third party lenses) is the most consistent and most extensive in the "mirrorless race," such as it is, and, to me, it is the leader. They have their faults too, but none that get in my way as much as what I found with the Fuji and Sony gear. I continue to use my Olympus E-M1 nearly every day: it has not yet failed to produce the results I was after.
G