For no particular reason except that I had an hour to kill on Monday I did the following comparison test to compare the soft focus effect of the Minolta Portrayer Soft Focus Filters on a non-portrait subject.
1) No filter
2) Portrayer P1
3) Portrayer P2
4) Portrayer P3
(photos are labeled to avoid confusion and P2 and P3 photos are lower resolution because of upload space restrictions)
The "P" series are supposed to be used with portraits and are reputed designed to softed skin tones only without affecting other areas. I normally use these with female portraits as the 85mm G series lens lens is often too sharp and thus a bit unforgiving. There is another set of Portrayers the "S" series but I don't own a set of those.
Lens: Minolta Maxxum 85mm f/1.4 G Series
Exposure: 1/5 second at f/5.6
Lighting: Photogenics PL375 with 30"x40" softbox to the right and black gobo opposite to the left.