Originally posted by msatlas maybe has big enough image circle for FF...nobody knows since who will buy it?
It will have a large enough image circle (according to Falk Lumo any lens with a FL several times greater than the required image circle will do so) but the questions are whether or not the optical quality is reasonably good out at the edges of the FF circle, and whether or not it is an entirely moot point given the current lack of a Pentax FF DSLR option.
I think that as usual many posters have seized on the negatives without pausing to look for positives. Sure I was surprised at the price, and I won't be buying one, but not because I think USD7000 is necessarily unreasonable for this lens. Of course we have to wait to see how it performs optically, but if it turns out to be superb, in the best Pentax tradition of *-grade supertelephotos, it is an intriguing offering. For one thing, in classic Pentax fashion there is no other manufacturer with a similar lens. The most similar option I can find is the Canon 400/4 plus 1.4x TC, a combination costing nearly as much. Optical performance being more or less equal I'd certainly rather have a 400/4 with matched TCs, especially given the oddly unweildy length of the DA 560, but if (and it's a big if) the DA 560 is a winner optically then I say good for Pentax.
How noisy is the DC motor going to be, though? That's important for wildlife photography, the main market niche for this lens.