I just came back walking the dog. I was carrying my OM1 with 1.8/50 MIJ mounted in the pocket of my jacket just to fill up the roll with some pictures of fallen leafs. May be there are some Pentax bodies equally small as the OM-bodies but the lenses aren't. And there is another difference to Pentax. In making the bodies small they made the controls tiny too. Olympus managed to minimize the size of the body while keeping the controls and the finder large. I have never felt it to be a drawback that I can not see the dialed in speed and aperture in the finder. The finder is uncluttered with distracting information. I use to decide on the aperture before raising the camera and the dialed in speed I can feel in my left hands middle finger and thumb, as the position of the grips of the speed ring is telling me.