I have owned a GH4 for the better part of 2 years. It has served me well during weddings, corporate events, and many other paid jobs. This October I will be directing a feature length action dramedy and after finally putting this camera through the paces, I don't think I can use it. The motion cadence in the Gh4's DCI 4k is not smooth at all.
I believe a a new camera or a rental may be in my future.
What camera(s) on the market today have both DCI 4k and decently smooth motion?