Fuji X-T1 with 56mm f/1.2 compared to size of Nikon Df with 35mm f/2
The X-T1 has the optional small grip installed, but even so, the Df is not very much bigger than the X-T1. That's pretty good, given that the Df has a mirror assembly, pentaprism and a full frame sensor. Although, the Df does not have a tilting LCD screen. Basically, the Olympus E-M1, Fujifilm X-T1 and Nikon Df are pretty close in physical size and weights are not too far off either (with the items I normally used already installed).