I'm sure the current 50/1 is "better." I've looked at its MTF curves on whatever that Swedish site is, and it appears that (unlike Leica) Canon designed its lens for usable performance across the field, rather than being as sharp as possible in the middle and then "falling off a cliff" about 1/3 out.
I agree that it would be fun to see some side-by-side pictures to see how the state-of-the-art has advanced since 1961.
However, this thingie isn't really an alternative to the 50/0.95 because you have to use it on a lame-o SLR, rather than an RF camera...