I have found modern EF lenses to be as good as RF equivalents when the entire package is considered: lens glass, digital post-processing, and mechanical operation.
Yes, a few RF lenses apparently blow their EF predecessor out of the water (the 50mm 1.2 by all accounts, but I haven't tried the RF edition) but my experience is most pedestrian L editions are only marginally better in terms of image output — not enough to justify the price gap by any means when the EF predecessor remains available new with warranty.
Throw in patent expirations and general R&D for equivalent yet patent side-stepping innovation and I'd say that the 3rd party landscape with AF on an EF mount basis can be more than competitive when price gets thrown in. Most of us are probably happy with very sharp at a $1,000 whatever below extremely sharp before post-processing even takes place.
Oh, and full time manual mechanical override remains awesome once grass, twigs, and ballon strings enter the view...