If you had only one lens on your OMD or other MF3 rig for walking around which lens would it be?

If I take just one lens with the E-M5, it's the Panasonic 14-42x: it's compact, and especially good at the widest angle, which I use most of the time.  Alternatively, I'll use the Pana 7-14 and carry the Sony RX100 in my shirt pocket, for shots that need a longer reach than the 7-14 can provide, and also flash, so that I don't have to bother with the Olympus mini flash (which casts a shadow with the 7-14).

Bobj