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In these particular photos the look is due to the lens (and the choice of aperture setting since the softening effect and aberrations are linked to the aperture value)- the first version of Pentax 85mm "soft" (135). On other lenses I use sometimes the Softar filters, but their effect differs and is not really comparable to this lens. If you are curious about the Softar I could dig up an example or two to post.
Ghibli, how d'you get that vignette/soft focus/distortion effect?