I shoot with a couple F100's along side my Contax 645 during weddings, I've always have tremendous luck and praise for the metering in the F100. If its backlit, than duh, you spot meter. But otherwise, just shoot at half-box speed and it nails it.
I don't like the F5. At all. It is too big (for 35mm IMO), too heavy, and you can't friggin see what AF point your using.