I really like the Zeiss Planar 1.4/85mm for its great optical resolution, build quality and sharpness even if it is wide open. But this is the first lens I really get frustrated by the crop factor of APS-C sensors. After using this lens on a Pentax ME Super film camera for a while I got so used to its true 85 mm behavior and I simply can not rethink of it as an 127 mm lens.
Although I have to admit the depth of field behavior resembling an aperture of about F/2 while using a sensor with crop factor 1.5 is still quite pleasant;)