I can think of no faster way to get dissed in a glamor/fashion/editorial/fetish discussion than to say you use Oly. Apparently, Zuiko lenses are completely incapable of shooting pictures of pretty girls. I have seen discussions of glamor techniques in which the Canon/Nikon types went on endlessly about which and what, and ignored anyone who talked Olympus as if they had farted (pardon the crude analogy).
This, of course is completely ridiculous. Rolando Gomez, who has shot for Playboy, Maxim, and Vogue, and founded Garage Glamour, shoots Olympus almost exclusively. The glamour types who dis Olympus are all middle shelf photographers who think the camera makes the shot. Or as Stefano Brunesci says, a $1500 professional-grade camera can take pictures just as badly as a $150 point-n-shoot if there is an idiot operating the shutter.
Besides, if the Nikon or Canon freak you are talking to knows anything about photography, mentioning Zuiko lenses should shut him or her up quite nicely. There is not a Canon/Nikon/Pentax lens around that will even come close to the clarity and quality of a Zuiko. Bank on it.