Went to B&H today, and wanted to look at the 17/1.8. Oh my. What a fantastic little lens. Yes, it's a bit expensive, but it's wonderful from what I can tell so far. First, the size: It is just barely thicker than the P20/1.7. The P20 is 25.4mm thick. The O17 is 35.5mm. Only my Oly 15mm lens cap lens is truly pocketable. This 10mm isn't going to make much a difference. And btw, the P20 is 63mm wide vs. the O17 is 57.5 mm wide. Weight is 99g (P20) vs. 120g (O17) Second, the look: You might not like the silver of the O17, but you have to admit, it's cooler looking than the dark grey of the P20! I like it on my black EPL3 and 5. Third, tricks: Actually neither lens has tricks. The O17 purports to have the snap-focus ring. That's actually kind of nice to flip into MF mode, without SCP diving, but the DOF scale is sooooo small, it's hard to really use. A little more gimmicky than truly useful. Fourth, AF: The O17 focus instantly. The P20, well.... doesn't. Fifth, Close Focus: The P20 focuses a bit closer (20cm vs. 25cm). Maximum magnification favors the P20 (.13x vs. .08x). Actually, neither is great. But I'm pleased the O focuses closely. Lastly, image quality. Well, there's the rub, lol. I just got it, and I no longer have the P20, so sadly I won't be able to test head-to-head, but in my initial shooting, the image quality looks very nice. Some pics from my hotel room while in NYC, on an EPL3.