Perhaps your definition of "soft" is different than mine.
I find 57s/58s to be quite "soft", as is the sm7. I guess that's why recordists like to put the sm7 on screamers, and why I don't like them in general. I don't know what a 57 sounds like without a tranny...perhaps they are "hard" sounding.
Beyer mics (e.g., m69, m88) are quite "hard" sounding, and I like them a lot.
Most traditional ribbon mics are "soft" sounding as well.
Note: my definitions of 'hard' and 'soft' are akin to those found in Mike Stavrou's "Mixing with you Mind".
A modded-Oktava 319 is a nice "soft" LDC mic in my opinion, soft meaning little bit dark, not too sibilant. The MJ-modded NT1a also heads in that direction with the replacement capsule. Either would seem good value for an LDC you would get a lot of use from....