I've tried my 50/2 and 60/2.8 micro for portraits on a D90 and am not impressed. The 50 feels too short to me and the 60/2.8 doesn't provided sufficiently shallow DOF for my taste. In the next few weeks I hope to try the Voigtlander 58/1.4 as a potential solution.
At least we agree on focal length for portraits on DX, as for DOF it really depends on taste and I don’t like nose, hair and ears so much out of focus as they are with faster lenses but I see your point.
As for Voigtlander 58/1.4 I hear it is very good lens, though manual focus …