Originally posted by Rondec I think the big thing is that both would be k mount cameras, whereas the 645 has a separate mount. While it is better in some respects than a full sized k mount sensor, it might just as we'll be an EOS mount because I'd need to get all new glass for it, which I wouldn't with full frame k mount.
So, yes, I think it could fill a gap, particularly if Pentax picks the right sensor.
And I'm sure many will agree with you... but just saying... it's not a given that it will be that way. The assumption that it's right for one makes it right for all is to be avoided. And saying it's a necessary upgrade path, isn't necessarily so.
Buying a D810 is all new lenses, but better pro lens options available than on a Pentax. For those who have the lenses, a Pentax FF would be a great second body. But the likelihood of the system equalling what Canon and Nikon have in FF is unlikely. APS-c and MF are the Pentax niche.. the likelihood of them filling someone else's niche with superior product is extremely unlikely.
There is nothing in Pentax land that equals the Nikkor 14-24, 24-70 and 70-200. Pentax has a few great primes for landscape shooters. But, as has been frequently noted, for all but landscape, Pentax is probably never going to be up to speed, in FF.
But then you and I both shoot a lot of landscape.... it's a conundrum. If an FF with the equivalent of the D810 sensor came out, we might "have" to buy one.
It's a very small market... those with enough limited or DA* Pentax FF primes, who won't want the superior Nikkor zooms. The recent results of a DA*55 1.4 compared to other FF primes being currently released is not the slightest little bit encouraging.
It often pains me to see people avoiding buying what they need, because they think Pentax might make what they want. I think we're pretty much certain Pentax will release something.... but will it be what you want? If you have a 31, 43 and 77 ltd, and don't want top shelf FF zooms, I suspect it will. Anyone else is dreaming.