I have been fortunate to be able to use a Fuji x-t1 for a while. Fujifilm Spain has given me for testing and playing with the camera. The experience was interesting I will not describe the technical features, because it makes no sense, the details are well documented and there are thousands of sites with abundant information.
I'll try to describe the feeling and the differences between this camera and the Fuji X-Pro1 or X100.
It is much faster focusing than the X-Pro1, very much. A lot. Sometimes is so fast that I doubted, especially in the beginning, it has focused.
I've done enough photos that I feel happy with this camera in this short amount of time. And that the only thing really important. i lose almost no photos, never failed eith the exposition, and almost never failed the AF.
I do not like having the viewfinder in the middle of the camera. I´m used to the freedom that gives the viewfinder placed at the left part of the camera in the Fuji X-Pro1 and X-100 I also own. This configuration allows me free the face and the other eye is available to be opened. Also the controls are more accesible ti the hands in the X-pro1.
On the other hand, I have to say that the electronic viewfinder is impressive. It´s a large window to the photo. Incredible.
I was teaching a workshop of studio lighting, and I was using this camera with tethering to a computer with windows 10 and Lightroom CC, without problems. The quality of the images was stunning.
So, I´m not going to buy this camera, although is almost perfect, small and gorgeous. Basically because I´m in love with the form factor of the X100 and the X-pro1 and I´m waiting the X-pro2... But is Highly recommendable.