Photoshop has made things like the 135mm soft-focus lens into interesting historical curiosity pieces. Even more specifically, the Presence->Clarity slider in Lightroom (try it on a portrait if you haven't). The "soft focus" wasn't out-of-focus softness, it was deliberately introduced spherical aberration. Before this neat lens existed, there were filters and even just the old pantyhose over the lens trick...
The question remains, why would you want to carry a lens that captured anything less than the maximum achievable amount of detail? There are tricks to throwing away detail, if you'd like, including, but not limited to, post production...which, to me, seems like the easiest way to go, though apparently some people puke at the very sight of the Photoshop flash screen.
Get one sharp lens at your desired focal length(s), and use it, then decide, on a per photo basis, what detail is wanted/needed. I can't for the life of me see why you'd want to do anything else.