The issue with the xt1 is that the lenses are bigger, the lenses are more expensive, and it doesn't have the in camera stabalization. I've been using Olympus professionaly for over a year now after having tried multiple other brands. The weight savings and adaptability far surpas most all cameras. The one exception being the gh4 for video. You just gain so much more versatility with the Olympus.
I have recently researched mirrorless cameras in the interest of purchasing one and without a doubt the Fuji XT1 is vastly superior to all the other items in this poll.
As a xt1 and a7 user, I can hardly agree to your statement. A7r is the best body for high quality still image in this poll. GH4 and a7s are the best for video. Olymus and a6000 has fastest autofocus. You must look at their strength and weakness separately. Fuji is a fun camera indeed but you can't simply call it the best.
So is the em1, also the em1 offered m43 comparability which gives you a much larger lense array than fujifilms. Also the Olympus offers in sensor image stabilization. (The sensor wives freely compared to the body. So you don't need special stabilizing lenses. The xt1 is only good if you plan to shoot full manual.
Indeed. As a current user i can tell, except for the cmos, everything is so great. If you shoot manual a lot, I recommend you to try A7. I currently own both and decided to use A7 to shoot manual.