Does it matter? If there's anything between these lenses it'll only be spotted under test conditions and may even be subjective or a matter of preference.

Olympus make quality products which are innovative and advanced. Olympus had live view and anti dust (and other features too no doubt) before the others and they offer customers an attractive choice and package.

I don't own any Olympus kit but if I had chosen to buy Olympus I wouldn't feel the need to justify my choice and purchase to anyone. I'd just bask in smug satisfaction in the knowledge that I'd bought a well made, advanced and compact camera that suited my needs.