Don't know about now because I don't really care that much with other brands now.
I don't shoot weddings for a living but when friends do ask to cover the event, I will use 2 bodies, F4 and FM2 as a spare. I never had any problems with F4.
Now I will still use 2 bodies, D2X and D200 or D70s. Sometimes its also easier to have lenses of different range on the different bodies but it an be quite taxing on the neck.