The main problem when using a 24mm lens is that you need to get very close for your subject to take up a significant portion of your frame. In the shot below, I was at about 1.2 meters from this girl and still, getting even closer would have been better. Obviously, getting so close becomes a challenge, especially when trying to remain unspotted. (click on picture for high res)
Lausanne – Leica M9 with 24mm Elmarit at F2.8, 1/500, ISO160