I was referring to
the EF version "of the Sigma 50 f1.4 ART" that I still have, you can spot it in my signature; the thread is about Sigma lenses for RF, so I thought that, when talking about the possibility of a new Sigma 50 f1.4 for RF, that "the EF version is already good enough to rival the Canon RF L" was clear enough to be referred to a Sigma, and not to the ancient Canon from 1993 (yeah, 30 years from the last 50 f1.4 from Canon...)
BTW I also had the Canon EF 50 f1.4 and it was by far the worst Canon lens I've ever used; I bought it in place of my EF 50 f1.8 first series, but @f1.4 it was ugly soft and without any hint of contrast, and from f1.8 to f4 was still inferior to the smaller brother, then they were exactly the same on narrower apertures (I probably had luck having a good copy of the f1.8 vs a bad copy of the f1.4), so I end up reselling it and buying a much more expensive EF 35 f1.4 L even if the focal was a little too wide for my taste as my preferred go-to-lens bright lens.
The moment Sigma released the 50 ART, I saw a couple of test and bought it immediately, reselling the 35 L that had never fully satisfied me; never looked back since, as the other alternative, the EF 50 f1.2 L, sucks compared to the Sigma.