Have you considered the 9-18 for traveling?

I have an equivalent lens for my Nikon J5 (so I'm in no rush to pick up the 9-18 - or I should say -was- in no rush prior to the Oly announcement), and it's the lens I use the most during the day when traveling. When I travel, I usually bring my J5 with the wide zoom and my GM5 with a pancakey lens (switching cameras is easier than lenses, imo) plus a lightweight long zoom.