I shot this musical with CV35 and 55 superspeeds, canon LTM 85/1.5, and as in many of these, the 135/2.8, wide open.
I set the iso at 400 and speed at 250, and pushed in post if I needed to.
here the 50/1.1 WO in very dim light: L1023324 by unoh7, CV 50/1.1