If I were deciding which of the original RF lenses to update, I’d use two criteria:
1. Which lens has the most room for improvement?
2. Which lens would sell the most copies?
The iconic RF 50mm f/1.2L immediately comes to mind. Not because the current lens isn’t excellent (I love mine and use it every day), but because it was designed very early in the RF era. Since then Canon has made tremendous progress in autofocus systems, focusing-group design, and lens packaging.
The RF 135mm f/1.8L shows how much Canon’s engineering has evolved. What would a modern RF 50mm f/1.2L II look like if Canon prioritized improved handling and balance while maintaining the same flagship-level image quality.
A slimmer barrel, more modern focusing architecture, and improved packaging could potentially make the lens noticeably easier to handle without sacrificing what made the original iconic.
I suspect a lot of existing RF 50mm f/1.2L owners would upgrade.
Sign me up for the preorder!