My first Fujifilm camera was the X-100. I was enamored with its retro rangefinder look and feel, manual controls, and terrific image quality. But I decided to sell it and get Fujifilm X T-10 which cost $400 less than the X-100. The reason for the switch had to do with my shooting style. I could not get used to the hybrid viewfinder.
The more than 100% view in the optical mode was confusing because I have all my life composed in a viewfinder up to the edge of the frame. The theory is that you can anticipate a shot better when you can see what is off the frame while looking in the viewfinder. For over 40 years I have been seeing what is off the frame by keeping my other eye open. I wasn't going to close it now, plus I can see more off frame through my other eye. In addition I had to rely on a line to define the image edge that often I could not see the line due to the scene brightness and contrast. As a result, I would switch to the EVF which was fine, but I did not need both.
The other reason for a switch was the lack of an articulated back. I love the versatility of being able to look down or up at the camera to compose shots or remain discreet.
So I sold the X-100, and bought the XT-10. I have since sold my X-10 and purchased a XT-2, a true upgrade.
In the Fujifilm X-100, the optical viewfinder shows a rectangle for the field of view for the sensor.