The M8 is about the size of one of the bigger super-zoom point 'n shoots (roughly; I have a Canon Powershot Pro 1, and my Leica M7, which is a couple of millimeters thinner than the M8, is bigger than the Pro 1 when the Leica has a 50mm lens attached. I don't have a sport coat pocket that would take it. Or the Powershot, for that matter.
JC