Again, i know most everything about these lenses, except i have no first hand knowledge, and many of you do. Barring it all doesn't fall apart at smaller apertures(and i know it doesn't), i'm really only interested in stuff wide open to f2.8 or so. if i could get away with narrower i'd just use a zoom. how about if i ask this, is the IQ at f2 and below on both lenses crap, decent, good, or great? and that's without cutting any slack. i know f1.2 at 50mm and f1.4 at 35mm is tough, but i don't care. thanks
For portraits, they both work fine wide open. Keep the subject toward the center, because the corners will be softer with significant vignetting, but that is the nature of the beast. With AF, nothing really beats Canon's 35L and 50L wide open.
In my experience the most accurate AF as far as L primes go has been the 35L and the 85L II. The 50L got better on the 5D MK III. These are not fast to AF though. The 85mm II is sharpest of the three wide open.
The bokeh is best on the 85mm L II and only challenged by my 200mm f/1.8L.
I think, if you had plans to get an 85mm f/1.2L II, then it may be better complimented by a 35mm f/1.4L.
Cams: Canon 1Dx, 6D, EOS M
Zooms: 17-40mm f/4L, 24-70mm f/2.8L II, 70-200mm f/2.8L II; Primes: Sigma 35mm f/1.4, 40mm f/2.8 STM, 50mm f/1.2L, 85mm f/1.2L II, 100mm f/2.8L, 135mm f/2L, 300mm f/2.8L IS II, 600mm f/4L II
Support: Gitzo GT4542LS/GT2830/G2258, RRS BH-55, Wimberley WH-200