The R5 Mark II’s electronic shutter reaches 1/64000s. In practice, 1/8000s is the useful ceiling for most fast-motion subjects — athletes, birds in flight, children running — because beyond that shutter speed, the light gathering falls off steeply and ISO requirements climb into ranges where noise management becomes the dominant concern. At 1/8000s with the RF 85mm f/1.2L and ISO 1600 in full sun, you get a completely motion-frozen frame. A sprinter at 10 m/s travels 1.

At f/1.2, the depth of field on an 85mm lens is approximately 2.5 centimeters at typical portrait distance. That is the width of a human eye. Focus must land on the near eye, precisely, every frame. The reason to own an RF 85mm f/1.2L DS is the RF 85mm f/1.2L DS — and the reason it is usable wide open is Eye AF on the R5 Mark II or R6 Mark II.