BMPC4K is superior camera
Based on downloaded footage. Not tested by myself yet.
BMCC has maybe 1 stop more DR than BMPC4K but the latter wins in everything else.
If you shoot in controlled light, BMPC4K may be better choice. Want to shoot Battlestar Galactica style? BMPC4K is your camera.
If you shoot landscapes on tripod more than controlled light production and dont care about 4K, BMCC is your camera.
BMCC may be good b-camera for the BMPC4K.
These are initial thougjts. I want to test one myself for more accurate assesment.