"But keep in mind that the 1DX Mark II is primarily built with photographers in mind which means that it will have limited video features."

Different camera, different usage. I don't see Canon advertising this as a cinema camera.

I believe the 1DX2 is build for travels, harsh condition, sports and photojournalism usage. You are right, if I want best video quality for price, I'll choose something like the URSA Mini, Sony FS7 or Red Raven but if I'm a travelling photographer that wants killer AF, a camera that resists almost everything and also good video quality, I'll probably go with the 1DX2.

It won't kill it. C100 has XLRs, build-in NDs, C-Log, Waveforms.
C100 MK1 cost 2500USD, MK2 cost 5000USD.

4K on 1DX is 1.4x, 4K on 1DC was 1.3x. Not a big change and most cinematographer I know like the S35 better for film making.

Shoot 4K Motion Jpeg 4:2:2 and downsample instead of shooting ALL-I HD 4:2:0..

I believe that C-LOG is not there yet to protect the 1DC for now, but will come in a future FW. And for now there's quite a bunch of picture profiles around.

Clean HDMI only in HD, not in 4K. You can't record 10-bit, it's an 8-bit camera.

Yes exactly. You said it "Dof is in fact not coming for the sensor but the lens"