I bought the xt-3 to live on a ronin - s, and while I love the form factor and the flexibility it brings to my kit, it's in no way a replacement for the c200 (or in my case the c300II). The AF, while fast isn't in the same league as DPAF (it tends to rock in and out of focus when the subject distance changes). I find it hard to grade in almost every situation...the color is just really different than the canon's and its near impossible to get it to "look" like what I like about canon's color science. In lower light situations it's just a different beast, and the color issues get more difficult to control. Finally...to me, it's a little too sharp...which probably flies in the face of all the criticism the canon camera's get here. It almost has a still image quality, which isn't what I'm after in a cinema camera. To each his own on this, but I prefer the image I get off the C300 by a huge mile --output raw to PR on the Atomos. I would never shoot a doc with the xt-3 as my A camera. Still trying to figure out if it's even usable B camera.
Exposure invariant color is certainly a desired aspect of color science. If one is ok with 8-bit, for gimbal use the Sony $900 A6400 with AI AF looks really good for detail, low light, and even skin tones now. RS is poor, though not really an issue for gimbal use.
Have you tried a lens diffusion filter or doing diffusion in post with the X-T3? As long as there’s no aliasing (as with C300 II), real detail is never a problem. After owning the 5D2 with aliasing, then appreciative of Canon fixing aliasing with the 5D3, I was very disappointed to see aliasing again after spending $16,000 for the C300 II, especially with the soft image!
For those looking to remove the plastic wrap off C300 II skin, external ProRes Raw is a great option. Expose to the right to minimize noise, and highlight recovery is awesome with raw (if you don’t clip).