Henri Cartier-Bresson (1908-2004) is one of the greatest modern photographers. It is interesting to note that even before the digital and iPhone Cartier-Bresson prefered small cameras for their portability and their silent, fast and discreet operation. He used a Leica M3.
Here is an interview conducted by The New York Times.
Photo 1 and 2: Henri Cartier-Bresson ;
See interview The New York Times ;
Henri Cartier-Bresson, photographer