Now some semi-controlled environment tests between the two cameras with similar lenses. See previous post for sample X-T1 photos.
Fujifilm X-T1 w/ 56mm 1.2 @ 1.2 ISO 400 vs. Canon 5D III w/ 85mm 1.2 @ ISO 400
Apologize about the white balance differences. In any case, the full-frame of the 5DIII (right) gives has a shallower depth of field which causes the foreground and background to blur more.
Full crop noise comparison - not from the picture above.
Fujinon 56mm 1.2
Canon 85mm 1.2L II
Similar noise level; more CA from the 85mm. In my use of the 85mm, nothing really compares to its creamy bokeh and sharpness, but the 56mm fuji is damn sharp at 1/3 the weight and more than 50% the cost.
Here are some more 56mm 1.2 shots. Very creamy bokeh and good isolation from DOF.
Some samples from the 85mm 1.2:
In summary, the X-T1 is a prosumer worthy camera, one that I will keep as a lightweight interchangeable lens body. I don't think that the 5DIII has anything to worry about, but both Canon and Nikon need to worry about customers looking for an APS-C sensor. Based on its size, vintage looks, lens options, 8fps, weather sealing, and weight, I would not even look at any APS-C DSLR / mirror-less offerings from either Nikon or Canon. I walked around with this camera for 3 hours today and didn't even feel the weight.
This one is definitely a keeper and I already have a 35mm 1.4 (50mm equiv) on order and should ship tomorrow. I will stick to primes for this body for now and not worry about getting zooms. The only thing left to buy now is a small shoulder bag.