Thanks for your thoughts Jani. I myself do happen to own a 1DS Mark II and for me I don't see the benefit in my case to move up to the 1DS Mark III. If I was still shooting with a crop factor camera I might feel differently, but in my case it probably makes more sense for me to buy a Phase One P25, which can now be had second hand for close to the same money as a 1DS Mark III. Although the Mark III will offer nearly the same resolution, with the Mark III being much more condusive to a photographic workflow, the Phase One back delivers a 22MP image from a sensor that employs a 9 micron pixel pitch which also allows me to use a Hasselblad with Zeiss glass. This to me seems more optimum than shooting a 21MP image on a much smaller sized sensor with Canon glass.
The other problem for the first 2 years that the 1DS Mark III will face will be convincing the commercial market, meaning ad agencies, art directors, hotel clients, etc. that a 35mm camera at any resolution will be able to produce an image as high quality as a medium format digital back on a Hasselblad.
So if the clients are not going to buy it, at least right away until they become more educated on the technology, then why should I is really the big question for me I guess.
Cheers…