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A new Canon Japan patent shows the optical formulas for various RF 50mm f/1.4 designs as well as an RF 35mm f/1.4. This patent deals with increasing focusing speed when using lens designs with large diameter elements.
I don’t think any of these optical formulas will become products, so the dream of a new 50mm f/1.4 from Canon probably won’t be coming true any time soon.
|RF 50mm f/1.4||RF 50mm f/1.4||RF 50mm f/1.8|
|Half angle of view||22.79°||24.05°||24.04°|
|RF 50mm f/1.4||RF 35mm f/1.4|
|Half angle of view||24.04°||32.48°|