Just got back from a pop-up photo gallery sponsored by Olympus in east London where they had a large display of all their cameras and lenses, specifically demonstrating the new E-M1. Anyway, the new camera is quite a bit bigger and heavier than the E-M5 and not of particular interest to me but they did let me try all their lenses on my GX1. I was really surprised at how small most of them are, everything looks much larger in product shots. The 75mm is about the same size/weight as my PL25mm. I imagined it being at least one and a half times bigger! I took a few shots around the gallery with it and it's given me results that look almost the same as the 25mm, on screen anyway. It's definately shot up as one of my most wanted lenses. Moral of the story, it's worth physically trying lenses!