I’m a naughty boy. Today I bought a used, but almost new 50L. Not as sharp and contrasty as the 85L at f/1.2, but good enough.
Not as sharp and contrasty as 85L wide open and more distortion
Much less CA and purple fringing compared to 85L
Smaller, lighter and faster auto focus and nearly as short DoF as 85L. Really creamy bokéh just as 85L.