I assume it's more of an issue if you're using older lenses. I could compare try to compare an OM 24mm with an E-System lens but I don't have anything thats directly comparable so I'm not sure how relevant it would be. Comparing a prime with a zoom isn't ideal, I need someone to give a an E-Zuiko 50mm

You mention that the others are now making their lenses with telecentricity in mind, perhaps that would explain why the new? Nikon 14-24mm f/2.8G ED AF-S NIKKOR seems surprisingly big. Admittedly it's 2.8, the other lens I'm thinking of is the Zuiko 7-14 f/4 which as you may have mentioned in the past wasn't exactly the last word in miniaturization