you can consider the newly launched 12-100mm F4 pro too. it is much better than 14-140/O14-150 any focal length and aperture. I used this >50% of the shots I did for recent trip.
Streets, landscapes, minimum focusing is pretty good too. versatile lens suited for travel... For low light, with this lens you have Sync IS, which gives another stop of stabilisation on EM5ii, Pen F or EM1/ii. but of course this lens doesn't help as much if you are shooting fast speed actions.
Do you know that that's an impossible question to answer? :bsmilie: It really depends on situation. If I'm daring enough, I can use 7-14 to shoot street but usually I use 12-40 or 17 for it. I can shoot landscapes with 12-40 but generally falls on 7-14. 40-150, I don't even know why I bring it, but it's for that couple of shots that may pop up