I never figured it out myself. Of all my cameras I've found I tend to go between MF and 35mm more on whim than panning. I do tend to take the 35mm rangefinder out more often as it goes into my jacket pocket and therefore is easier as a daily carrier right now. That said, I carry my ETRS when going to a more specific place where I might get in some shooting of more than a casual nature. Now admittedly, I do not get away from 35mm even then as I carry a 35mm back when I go out with the ETRS. I tend to use the backs in lieu of the lenses. I use a 40mm lens as a standard lens. With the 120 back it effectively has an angle of a 28mm on 35mm so I get the 2 focal lengths carrying less weight as well as economizing. I'm not sure how long I'll continue to do this as recently, I've dusted off my Rolleiflex T and will be getting it serviced. As it weighs less than the ETRS with the WLF I can see it as a daily carrier though it is too large for a pocket obviously.