I don't own the FA 77, but the DA 70 is close enough that I will comment. I own the DA 70 and DA *55 and I must confess, I don't see a lot of difference between them as far as "flattering features." The biggest thing is that I have to get a little closer to get the same photos with the 55 than with the 70. The lenses themselves render differently as well. I like the bokeh a little better on the 55 than the 70 (at similar apertures), but the 70 is pretty smooth in most situations. The 55 is also sharper at similar apertures.
Photo of my daughter with the 55 at f2.
My daughter again, but with the DA 70 at f2.4.
Obviously, theses are very different photos. However, the biggest differences in these lenses have to do with colors and rendering (particularly colors). 55 seems to be a little warmer than the DA limited lens, which seems more neutral. Both are quite sharp from wide open, although the 55 opens 1 and a half stops wider.