Every Mamiya AF and MF, D, and LS lens will work on the DF/DF+ with the one exception I'm aware of being SOME 105-210mm lenses.
A small number were produced with an autofocus CPU which is not compatible with modern bodies. Later production runs used a more modern CPU which is ready to use on a DF or DF+. To make them compatible requires changing out this CPU which I've only had customers do twice (maybe I'm forgetting another one or two?), and it was a while ago. So forgive me for the vagueness but the price for this service was something like $350. You can check with your dealer for exact pricing on Monday, assuming this service is still available (I have no reason to suspect it's not, but like I said it's been a while).
Of course my biased suggestion (being a dealer) would be to buy such a lens if possible from a dealer so that they are responsible for making sure it's in ready-to-use working order. But you could also buy used from another user who has a DF or DF+.
Edit: I had typo'd 55-110. As Steve very rightly says below it's the 105-210 where some of the earlier production runs had the older AF sensor. Thanks Steve!
