SUMMARY
A head-to-head test compares Canon's new RF 45mm f/1.2 STM with a used EF 50mm f/1.2 L USM, as their prices have converged. The RF lens is lighter and sharper in the corners, while the older EF lens offers slightly better center sharpness wide open and a softer bokeh. The EF lens provides greater adaptability to different camera systems, whereas the RF lens is exclusive to Canon mirrorless bodies. Ultimately, the choice depends on prioritizing modern precision and lighter weight versus vintage character and broader compatibility.
TAKEAWAYS
Canon's RF 45mm f/1.2 STM and used EF 50mm f/1.2 L USM are now comparable in price.
The RF lens offers better corner sharpness and lighter weight, while the EF lens has softer bokeh and wider compatibility.
Sharpness varies by aperture and focus distance, with the RF excelling at close range.
The decision hinges on whether to favor modern optical performance or vintage lens character and adaptability.