Originally posted by mikeSF i too do not quite understand why you would not just buy a second 645D/Z body to use with all the glass you are carrying. Having another complete system at the ready seems bothersome.
Most people using the Pentax 645 system today have moved into it recently, relatively speaking, so almost everyone with a D/Z has at least their previous camera if they haven't sold it yet. I've kept my 5D2 and 24-70II because it's still a lighter, smaller and somewhat faster camera than the Z which is good for occasional run & gun shooting. For instance, carrying the 645Z+55mm and the 5D2+24-70 is less of a burden than if I had another 645Z with a zoom on it, not to mention the second option being a heck of a lot more expensive... I already bought the 5D2 when it just came out for full price and I'm not done squeezing out all it has left, while the Z is still on lease and all the lenses I have for it I'm effectively borrowing from a friend until I turn up with the cash for 'em.
For those wanting to ditch their old SLR systems, something like a compact mirrorless camera along the lines of a GH4, A7II or EM1 with a nice zoom lens would hardly add much to your kit. heck, I could stuff one of those into my bag's side pockets.