[...] but the 60mm Distagon just feels right, less narrow than the 80mm Planar and not as fish-eye-y as the 50mm. Could make a good "one lens" lens.
Agree with that. I have heard people saying, "the 60 is neither fish nor meat", not wide enough for a wide, not long enough for a standard. For me it is just about perfect, particularly if I carry just one lens. Bottom line, it does not work for everybody, but if it does for you, it's a winner. A very good lens in a small form factor.
One aspect which has not yet been discussed up to the point I read that thread (about page 2):
the 60 can focus relatively close. In any case much closer than the 80. This opens up creative opportunities without the hassle of getting the extension ring out of your backpack, mounting it, etc... which is (at least to me) an important factor when traveling.