Roger Hicks
Veteran
a 135mm f3.5 (let alone f2.8) has even less DOF than a 85 f1.4 at a given distance. Ok, for the same magnification/framing you could back off with a 135, and that buys you DOF. But still, wide open with a 135 on a rangefinder, there is very little room for error.
It's not so much DoF that I was talking about, as the mechanical precision required to couple at all. This is why I especially like the 135/2.8, as the effective base length is increased by 50%.
Of course Leica made an 85/1.5 lens for RFs, the Summarex, but at an impressive price and in small numbers (fewer than 5000).
Cheers,
R.