The Leica's are great for artistic, "photo journalist" shots. If you had to do a pile of family portraits or use some fill flash on something, you'd be in trouble. I know a lot of the really high end guys just don't do those kinds of shots, so working with only two Leicas is feasible. For the way I work, I wouldn't give up my F5's for anything.
A well respected news service photographer once tried to sell me his Leica M6. I asked him what was wrong with it, and he said, "nothing, I just can't afford expensive jewelry".
David Buzzard