I 've owned several Nikon F's and F2's in the past and they are excellent cameras, but I.M.O. although they came late to the pro sytem camera party Canon's F1's system got it even more right, the Canon New F1 was I.M.O.the ultimate manual focus pro system S.L.R.
Actually, Canon released a pro system body for each of Nikon's releases.
Nikon F (1959) - Canon Flex (1959)
Nikon F2 (1971) - Canon F-1 (1971)
Nikon F3 (1980) - Canon New F-1 (1981)