I have no data on this....I've been droning on about that I'd like to purchase this lens ever since I sold my 'thrifty fifty' RF, which whilst great value for many adds to little if you also own a L-series zoom lens. And indeed I concur that if Canon is not allowing a 3rd party to fill the gap they should offer one themselves.
I tend to think that there are more 50 f/1.8 owners that would move to such a lens than 50 f/1.2L owners that would have "settled".
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