Then there will be less reason to upgrade for me. The 5D has about one stop less noise than the 40D (at high ISO); about equal noise to the 1Ds3 when the 1Ds3 image is downsampled to the 5D file size. The 1D3 has an ISO 6400 and less noise than the 5D, I guess, but also fewer pixels.
In the meantime we have the Nikon D3 with marginally lower noise than both the 5D and 1Ds3. The 5D upgrade will have to contain newer technology than already exists in current Canon cameras if it's going to surpass Nikon.
12.7 to 16mp doesn't seem enough regarding increased image quality. But combine that with half a stop or more of lower noise, as well as all the other inevitable features such as faster frame rate, LiveView etc, then it becomes a very attractive package.
Fair enough, but you're not calculating noise and an upgrade to NEW technology with a new 5D. If the noise on the 5D is already better than a 40D, etc., I wonder what it would be with the new technology inside?
The thing with more pixels is that if you want to sell your images to professional sites for advertising, books, etc., about the minimum they accept is 16MPs. So let's say we keep shooing and in a few years get good enough and have enough "stock" to actually be accepted by an online broker of "professional" images, and you have all these files taken with a 12.7MP camera.
I'm seriously thinking about forking over the loot and getting the 1DS3 for that reason. The 5D will be a nice portrait camera, for local jobs, and a nice backup camera. I just have to figure out how to eat and buy the 1DS3 at the same time. (I guess there is always bulk rice, beans, and hamburger for a few months, without eating out everyday like I do now.)
On the other hand, I'd also like to invest in a new 100-400 IS L lens, and a nice 50MM prime too. If I bought the updated 5D I'd have money for all of that. If I get the 1DS3, those lenses will need to wait for next year.