Above I meant to say subjective, not objective. that link link and everything on the page it takes you to still work for me.
lenses used in the comparo are-
50mm lenses
EF 50mm f/1.2L, EF 50mm f/1.4, EF 50mm f/1.8 II, EF 24-70mm f/2.8L@50mm, EF-S 17-55mm f/2.8 IS @50mm
85mm lenses
EF 85mm f/1.2L II, EF 85mm f/1.8, EF 70-200mm f/2.8L Non-IS @ 85mm, EF 70-200mm f/2.8L IS @ 85mm
135mm lenses
EF 135mm f/2L, EF 70-200mm f/2.8L Non-IS @ 135mm, EF 70-200mm f/2.8L IS @ 135mm
200mm lenses - All at f/2.8
EF 200mm f/2.8L I, EF 70-200mm f/2.8L Non-IS @ 200mm, EF 70-200mm f/2.8L IS @ 200mm
It's a pretty good source of info, i just wish it would get some updates. some good astro work info there as well.