I have not, and I grant that at a point in time (1950s, 1960s) they were the camera for photojournalism and other field photography.
I was speaking of Leica today, I am sure they are still very nice cameras but professionals don't use them anymore. They are strictly for showing off that you paid a lot of money for your camera.
Anyone know what their security devices are "Access to the NAGRA security devices is restricted to Law-enforcement and official government agencies only. "
I did for a long time, and I haven't found anything that even comes close, at any price.