Yeah, as Kit said, almost certainly. The old one is a traditional double-Gauss with fairly poor performance wide open. The RF seems to be a modern "pickle jar" with a considerably more complex optical design. The weight of the latter is 950g compared to the former's 580g.
Interesting. Thanks for the info.
Yes, I've been somewhat underwhelmed with the 50 1.2 (EF) IQ-wise, but it has still gotten me a few unique perspectives. Hopefully this signifies an update of the EF version in the near future.
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