Olympus point & shoots used to be absolutely awful, and I had to both use and support them when I worked at Amherst College. I had a hard enough time getting the sodding things to do what I wanted, nevermind trying to explain that to AmhCol students and (shudder) faculty. My recent experience with Olympus cameras has been limited, but my reaction is still basically the same: their UI is lightyears better than it used to be, but it's still pretty awful by today's standards. Being able to interact quickly with a camera is key for capturing candid shots, particularly in low light. Point & shoots are inherently sloweer than DSLRs, and it is essential that the UI and menus be as intuitive as possible. Truth be told, Fuji's menu system in the X100 is only okay, but the camera itself has so many dedicated physical controls that the UI is much less of an issue.
Not gonna lie, I have no real interest in the M9. Even disregarding it's eye-watering price tag, the sensor in it is simply not that good. It's high ISO performance is only decent, and it gets some weird color artifacts with super wide lenses (which is supposed to be an area of strength for rangefinders.) To continue the above thread, the M9's UI is pretty piss poor. That is unforgivable in a $9000 camera. In terms of interface, the M9 is bested by the X100. Even Leicaphile and noted Froot Loop K-Rock prefers the comparatively humble Fuji to the M9. If I were going to shoot Leica, I'd rather have a film body anyway. Give me an M7 and a 35mm F/2 Summicron, and I'd be all set.