Last summer holiday in Austria, I had initially mounted a 50 on my Bessa, but found it too constraining after just two or three shots. Fortunately I had the CV 25 along, put that on the camera, and didn't take it off for two weeks.
The weird thing was, I had expected to shoot everything with the 50, as I had used that during most of a skiing holiday a couple of months earlier and found the 25 too wide at that time.
At the moment, I'm having a NEX/16mm which is 24mm equivalent as a carry all day camera along. The 24mm equiv. FOV sits perfectly fine with me..