I shot internal 4k and instead of using a lut I used a preset in MBL called log grading power suite. In Sony Vegas they have a setting in properties called pixel format and when I choose 32 floating point video levels, the macro blocking is much reduced and alot less banding.
I am still...
We used a small LED for the Key and no fill other than ambient light. I think it held together pretty well up to 3200 and even through the highest, it could be usable for certain creative work.
Audio was plugged straight in using pre-amps on the camera with a wireless. Not to noisy and...