Fujifilm’s main goal when developing the new GFX100RF was to make it as compact as possible. This is how it compares with the smallest full-frame camera with a fixed lens, the now 10-year-old Sony RX1rII:
So when it comes to the thickness (camera+lens) the Fuji is really close to the Sony. But they has to give up on brightness (lens if f/3.1 in FF terms compared to the f/2.0 Zeiss lens on the Sony). But the camera is wider and much taller.
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via CameraSize