I don't know about Dali, but looking at FEDs vs leica pages, I stumbled across this thing:

Allegedly, that's comrade Picasso with a FED-2 around his neck.

I also saw a documentary on Helmut Newton that that guy really didn't care which camera he used. I believe he had a digital 4/3 system, a rebel with a kit lens and of course a number of camera from the beginning of his career, but never a leica and maybe not even a hassy.