I do not swap (prime) lenses because I shoot outdoor in foul weather: i.e., typically bad conditions unsuitable for lens swapping. These could be rain, dust, sand, .... but that is 60% of my shooting.
I recently experimented with a combo for two bodies: one body with a prime and one body with a walk-around zoom. It works well for me. For the body, I use K-3 and K-7, and I used the zoom (DA18-250mm) on either. For the prime, my favs are the Voigtlander Nokton 58mm, FA77mm Ltd and FA31mm Ltd.
With this two-bodies combo (one body with a prime and one body with a walk-around zoom), I do not miss anything. Interestingly I found that my my keeper rate is much higher with the body+prime, that with the body+zoom.
Hope that the experience may be of interest.
Last edited by hcc; 04-19-2015 at 03:50 PM.