Originally posted by RobA_Oz There's no doubt that the 645Z is an attractive proposition for some professionals and for some enthusiasts who can afford it. In this discussion, there are two aspects that need to be teased out further to deal with the OP's proposition, and they are both concerned with marketing, in the broader sense of the term.
The first is the often-mentioned question of which of the professional market sub-segments a particular camera will sell into. Clearly, the 645Z will have broader appeal than its predecessor, but the projected production figures spoken of in other threads don't indicate that it is expected to push 35FF aside any time soon. So, I think we can fairly safely assume that it will appeal principally to landscape and studio photographers, as did the 645D. The extended sensor sensitivity means that it will be more versatile in low light work, but on the whole, it will probably be seen as a 645D replacement, rather than a game-changer for most current 35FF users, even though it will attract some who are looking to gain an edge over the competition, probably in premium wedding photography, at least at first.
The second is the matter of marketing the range of Pentax cameras. It's a fairly limited argument to say that there doesn't need to be a 35FF body because the 645Z (and even, in some respects, the D) provides a technically superior sensor, because at least some other elements of the camera have to be superior as well. The technical aspects also mask the notion of value proposition, which is what drives choice in the professional market. If the 645Z was being sold in the near vicinity of, say, the D800's price, then it would stack up fairly well as a value proposition for a substantial slice of that camera's potential buying group, but at more than twice the D800's price it doesn't.
Those are the two considerations that counter the proposition that there won't ever be a Pentax 35FF camera, in my opinion. The lack of suitable badged lenses is a furphy – you aren't going to hear about those until a body is announced. Even the infamous contention about IBIS incompatibility with a K-mount 35FF body seems to have subsided, so I'm at a loss to understand why the lens issue hasn't done likewise.
you know, they even have a section the specifically compare to 135 camera:
Medium Format Digital Camera and 35 mm Full-Frame Camera / PENTAX 645Z Special site | RICOH IMAGING
where they don't even compare 645z to other MF camera! they are targeting people who wants FF, not targeting those who wants MF. They are, using this 645z to compete in the FF segment.
If they are presenting a 135 camera, do you think they will market this 645z as a FF camera competitor?
If they have a 135 camera in the making, they will target this 645z to compete in with other MF cameras and compare them in their marketing website.... the price alone is a big attractive point for the 645z compete in MF segment.