Originally posted by kernos I have used the DA 50mm 1.8 and while competent in lots of ways does not have the wow factor for portraits that either the 77mm or 31mm seem to be able to produce.
Well, of course. The DA 50mm is a great lens, for the price. But obviously a lens that costs 10x as much simply
has to be better.
I have DA 35mm f2.4 and DA 40mm XS. DA 35mm has quite some distortion, so it is not great for portraits, unless they are really wide, environmental portraits. If you take a photo of shoulders and face, the face will look a little round, with wider nose - generally not something people like in their portraits. But it is a good, sharp lens. I think it is similar to the DA 50mm, though - great, light, sharp, but simply not on the same level as the Limited lenses. DA 40mm XS is a good compromise, as it is the same optics as SMC DA 40mm limited, but at a lower price (due to lack of QS, lens hood, distance scales). Simply put, it has those deep contrasts and colours you can expect from DA limited lenses. The XS has rounded aperture blades and Tessar-based formula, which gives interesting bokeh, but it is not exactly a
bokeh monster (like the Voigtlander you mention)
DA 35mm f2.4 is probably my most used lens, its great on APSC, but I would use something more telephoto for tight portraits. If you have a bit of landscape and the whole body in the shot, it might be enough. It is sharp, but not super artsy.
DA 40mm XS is a good lens, super compact, with nice colours and contrasts. It has more of the Limited character at the price of a regular DA lens.
But since you like the FA 77mm so much, you should probably think about FA 43mm limited. Its the least expensive of the limited lenses and its bokeh is slightly better than the DA 40mm (the FA is more telephoto and has faster aperture, and more 'character').
Edit: Also, there are many many legacy and third party lenses around 50mm to 55mm and 58mm. Something like the Helios 44(many versions of this lens, some are even kmount) can give you amazing bokeh at a really low price. Or an old Takumar, or Pentax A series, a Rikenon 50mm,.. its hard to get a bad prime lens in the 50mm range, though there are significant differences in the
character (bokeh, wide open sharpness, flare resistance, contrast, colours). If you don't mind going more or less manual
Tl;dr: DA 40mm XS, DA 40mm limited (SMC or HD version, just different coatings and aperture blades), FA 43mm limited.