Hey Raf, did you have your camcorder lens wide open? Even first footage from Brevis looked quite bad cause NR was engaged and the camcorder lens were wide open.
XH A1 tends to cast horrible color abberations when used wide open with DOF adapters. And don`t use any in camera Noise Reduction. Use low gain if needed but close the iris on camera a bit.

I hope this helps,
T