Legacy vs E-Mount Lens IQ

None of the old MF lenses are as cheap as they were a few years ago.  Most of the brand name lenses are pretty good, and deals are out there if you look hard.  The fast glass is getting fairly expensive again, though not what it used to be.   One lens to look at is the Canon 50 3.5 macro.  It's only 1:2, but incredibly sharp and can go to 1:1 with a converter.