I love this sort of thread - it gives us an excuse to go on about the lenses we like, whether or not they suit the OP's purpose!
How important is AF to you? If the answer is "not very", then all sorts of lens goodies await.
I have just the one Mamiya AF lens - and it's a zoom: the 55-110/5.5 AF. You could say it's my walkabout/convenient/everyday snapshot kind of lens. But it's a great performer too.
Everything else I currently have is manual focus. There are several reasons for this: (1) I had M645 cameras before my 645AFD & DB; (2) the fastest and most unique lenses are only manual focus; (3) they're cheaper; (4) I also use them on my Canon and Fuji/Nikon DSLRs, and thus avoid duplicating focal lengths with additional 35mm primes. So far, no-one has come up with a cross-platform adapter which can operate the electronic aperture of the Mamiya AF lenses, so it has to be the manual focus lenses for use on other systems.
The other AF lenses generally don't entice me.
The 1st-gen AF lineup are now quite affordable, but were by and large optically identical to some of the manual focus ones, and not exciting in terms of aperture speed. I have the manual focus 105-210/4.5 ULD zoom, and might upgrade to the identically specced AF version, to complement my shorter AF zoom...that's about it.
There are a couple of 2nd-gen D lenses that might figure in my future - if they really are that much sharper wide open. But right now they're well down my shopping list.
My camera cannot operate the 3rd-gen LS lenses, and in any case they're too expensive for me and I don't care about flash speeds.
So, back to the manual focus lenses!
I have: 24/4 ULD Fisheye, 35/3.5 N, 45/2.8 S, 55/2.8 N, 80/1.9 C, 110/2.8 N, 120/4 A Macro, 150/2.8 A, 200/2.8 APO, 210/4 N, 105-210/4.5 ULD zoom, 2x N TC.
I had: 45/2.8 C, 70/2.8 LS, 150/3.5 C
I want: 300/2.8 APO
Also, in terms of adapted 6x6 lenses -
I have: 300/4 CZJ MC Sonnar
I had: too many CZJ/Exakta-Schneider/Pentacon/Kiev lenses to list, from 30mm to 500mm...the better ones being the 30/3.5 MC Arsat Fisheye, 55/4.5 MC Arsat Shift, 60/3.5 Scheider Curtagon, 120/2.8 CZJ MC Biometar, 180/2.8 CZJ MC Sonnar. [Actually I still have all of these bar the Curtagon - I just haven't got round to selling them yet - PM me if interested]
I want/am curious about: Pentax 67 105/2.4 and 400/4, Hasselblad 110/2, RB67/RZ67 500/6 APO
And to round it all off, what lenses could I not live without? What keeps me in the Mamiya ecosystem, when from a camera point of view Pentax 645D/Z is the better option? Well that would be: 24/4 ULD Fisheye, 80/1.9, 120/4 A Macro, and the f2.8 APO telephotos. Of these, only the Macro has a Pentax equivalent - or an autofocus Mamiya/PhaseOne equivalent, for that matter!
Ray