Canon once again talks about the benefits of the bigger diameter RF mount over the older, and smaller lens mounts in the video above.
So why'll we wait for more RF lenses, we can at least learn a bit about them.
From Canon Imagine Plaza:
Canon proudly introduces a new imaging system, the EOS R System, with RF lenses at its core. But what makes these lenses so outstanding? This video introduces the innovative features of RF lenses that open up new possibilities in photographic expression.
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cheaper lenses at the same quality
same price lenses at better quality
even more expensive lenses at much better quality
wonder which one we're going to get ... hmmm ...
I've never had a DSLR lens that was as good as the 18, 21, 24, 28 & 35 mm Asph. M lenses, not even a Zeiss or a Canon. (Yes, I know, this isn't scientific).
Is the short flange distance the main reason ? I tend to believe it has at least a part to play, according to the Leica opticians, it definitely has!
Also the final sample image (antelope or bighorn sheep grazing in a field) is underexposed and IMO a bad photo - certainly they could have used a better nature photo?
Price doesn't explain everything...but getting wide-angle lenses closer to the sensor can (mustn't) be an advantage.
This certainly doesn't apply to teles (Canon's big whites are at least as good as the discontinued Leica Apo teles, most certainly even better).
PS: I too prefer DSLR over mirrorless...