Some personal opinions on 77ltd for candids and other focal lengths.
It depends on the isolation you need and personal comfort of working distance to strangers.
31,35mm works about the same for me. Usually they show off a bit of the environment (context).
Working distance is relatively 'normal' as in I don't find a need to purposely step forward or back to get what I roughly see with my eyes.
It can be rather near to subject though for half body or closer shots.
FA35 FA31ltd
40,43mm work quite the same as the 35mm but usually a bit tighter in FOV and quite a comfortable working distance.
The 50mm is about the same, but again a bit more tighter.
DA40XS
Above that, like the 77ltd, its usually a pretty tight framing in most cases unless the view can be unobstructed and there is plenty of space to move back on.
Framing needs a bit of 'ready time' and to me it does not come as WYSIWYG between eye and 77mm framing.
In other words, if I turned a street corner and saw something interesting 2-3m away from me, the framing will be too tight to respond fast enough to just lift up the camera and shoot like the 31,35-43mm focal lengths.
FA77ltd