Armando I had the Xpro1 for awhile and I think they have the best lenses. They approach Leica quality. The noise at high ISO is low for a cropped sensor too.
But Olympus whips Fujis ear end when it comes to focusing.
I wouldn't trade my full frame for a mirrorless camera. There is a huge difference in dynamic range and color depth. Also when I process images the detail is just way better and no artifacts.