Heard good things about this camera but if I were to buy a Fuji it would be the XPro1, which currently has one big drawback its slow AF.
I had the camera in my hand and I tried its AF which was indeed much slower then my Nikon but the camera felt amazing in the hand, it had this old/new things going for it and from reviews I saw its IQ is excellent.
Still I am happy with my D7100 and not planing to leave to mirrorless anytime soon.