I think the rendition of the new mid-teles like AF-S105/1.4E, Zeiss Otus/Milvis 85/1.4, Fuji 56/1.2 et al. reflect the modern style of portraiture: paper thin DOF and clear contrast between sharp focus and soft bokeh.
Years ago, the portraits, especially those of the females, were shot with soft focus lenses, and some specialized lenses like Leica Thambar 90/2.2 or Rodenstock Imagon even used attachments to enhance the spherical abberation or flare for the soft focus effect. The older Nikkor mid-teles were designed with that in mind: the spherical aberration increased when focused in the portrait range, which should be the similar concept.