Lately I've been feelong a LOT like that little guy in the bottom left!
(the bird would be the banks, insurance companies, pharmaceutical companies, etc. Probably also my ex-wife, if I had one. )
Anyway, I also have & love a Nikon Ai-s 300 / 4.5 However, it has an "almost bothersome" amount of CA. If I had the money, I'd get a Mamiya APO.