View from cockpit of 747. It was not as good as from a 737, for sure. Our landing minima DH for Catlll was 20' whereas the 757/767 would be 0'.
Reason for PVD. Not all operators have the PVD fitted but I am guessing that it was originally intended to get minima down to RVR 100' as the T/O minima otherwise would be as published in the Jeppeson.