Most of the time I run my Olympus 12-40 f2.8. It's just a fantastic, sharp lens, and covers good bases.
If I want extra length, I have a 50-200 f2.8-3.5 that is meant for Olympus 4/3 cameras but I have an adapter for my mirrorless. Picture quality is wonderful, but I get sick of lugging the big thing around.
Since I've taken my bowhunting seriously, my 14-150mm f4.0-5.6 has become my 'go to', until my camera fell over on a tripod in a harsh wind and broke the lens. I've since been alternating between my 12-40 and 50-200 and have only just pulled my finger out and send the 14-150 away to Olympus Australia for assessment and repair.
The picture quality isn't as good but being able to zoom that far with something that has wide angle in close is great when you're conscious of weight and swinging around a camera on a tripod while you're trying to stalk game.