The venerated RF 50 and 85 1.2L’s feel a little long in the tooth. Both are amazing optically but are too fat, an artifact of the very large and powerful ring USM focus motors needed to move their massive focal groups. The more modern RF 135 1.8L shows how far Canon engineers have come. It is almost impossible to take a bad portrait with that lens.
Today’s Canon engineers could probably retain the 50 and 85’s optical properties and deliver mk ii versions with internal focus groups driven by nano USM. Such a design could be slimmer, handle better, and autofocus more quickly, quietly, and with more confidence. In other words, they could feel more like the 135 1.8L.
My opinion is that a redesigned 50 and 85 1.2L would both inspire and sell. Heck, I’d unload my current 50 1.2L and buy both. Throw in a similar 100 F1.4L and I’d buy that as well!