Although I don't have one, I am certain a Contax 139 would be past the right side of this lineup. The Olympus Epic truly is a pocket size camera - not only in size but weight too. The Nikon 35Ti is pocketable but it is in the heavy side. The half frame Olympus Pen FT is small - no mirror hump, and the lenses are small too. It is an SLR and definitely it's robust construction makes it almost the weight of the MX/OM1. So just how cool and/or compact really . . .
My daughter owns an Olympus OM1 and the Contax 139 was about the same size. A little thicker maybe but not quite as long and much more ergonomic. Of course I am going by memory here.