>>4382713pana 20mm pancake: tiny and sharp, slow as tits autofocus though but great otherwise, everyone shills it because it's good
some sort of standard zoom since you're traveling, the oly 14-42 ez or pana 14-42 (not the electro-only PZ one) or compact and neat pana 12-32. honestly there's a dozen different lenses in this segment and they're all pretty damn similar without even including the pro/leica lenses, just pick whichever one feels normal to use since olympus and panasonic have opposite zoom ring directions
other than that it depends entirely on what you're shooting
>>4382718my 40-150 is sharper than my china oly primes from 40 to about 130mm, and then at 130-150 it completely falls apart which is a shame but not the end of the world
>>4382846so basically they work 100% other than the on-lens Fn. button, of which none of the listed lenses have? sounds good to me