You guys have some interesting opinions about the 5D Mark III. It was one of the most anticipated camera upgrades ever and now that it's out, people seem to shun it. I've heard people talk about "issues with it". I'm interested to know what issues everyone is talking about because so far (with the exception of native RAW support for Aperture or LR), I haven't had any. Personally I took the plunge and sold my 1D4 to pay for it as I also have (2) 1DXes on order to cover my action photography. I couldn't be happier with the IQ. I was so tired of looking at nasty noise in the shadows of images off my 1D4. That noise is all but gone on my 5DIII images. And the focus is just spot on! About the only things I miss from my 1D4 is the incredible battery life, simplicity with less button clutter and fast fps.
BTW Tom, I love your shots that you posted. Very nice indeed.
Thanks DarkKnightNine, your opinion is very welcome and thanks for the kind words on the images.
I dont think there any problems with the 5D MKIII in terms of specification if anything it is pretty much the perfect camera for me a supercharged 40D. But I will wait until the niggles are ironed out before a purchase. Then I saw the 1DsIII I have found one locally to me with less than 20k actuations for £2500 which is a steal IMO. So thats why I started the thread. Again the 1D4 would be nice but is currently £500 more than the 5D MKIII with the kit lens secondhand and most are pretty used! As I described I dont like the 1.3 crop. I dont really have need for the 10fps 6 is fine for what I do.
I'm about to plagiarize myself from another post, but here goes.
The 5DIII vs. 1DsIII debate is a tough one. I think I'm committed to the 5DIII at this point, but the 1DsIII is awfully tempting for roughly the same money. I shoot cars, and the highest I pushed the ISO was 3,200 on my last shoot, and most of the time ISO was 400 or less, with the occasional tick up to 800-1,600. That's another way of saying that if the biggest advantage of the 5DIII over the 1DsIII is ISO performance, I didn't push it hard enough on this last shoot to benefit from it. That said, I do have some ideas on how to really push the ISO for creative effect in the future, so perhaps that will change my opinion once I fully utilize the 5DIII's potential.
IQ aside, the 5DIII does handle very well. I still prefer the handling of my 1DII, but the 5DIII's ergonomics and responsiveness are very good. Most the second-hand 1D bodies I've seen for sale are beat to hell, probably since many are used by sports photogs and journalists that are on the go. However, I've seen many 1DsIII's on ebay that are in outstanding condition. Perhaps they've lived a more coddled life inside a studio
I also shoot cars so understand the problems. I agree with the temptation £500 cheaper for the one im looking at, but the 1Ds III is about the same performance noise and IQ wise as a 5DMKII? Which would also be a huge upgrade in IQ to my 40D. I do or would like to go up higher in the ISO range but my 40D doesn't really allow me to do this and if I do Noise ninja is my first port of call and it does a pretty good job tbh!
I would say the only reason I don't get as many shots as I should is by trying to keep the ISO in the lower end of the scale and risking a bit of blur rather than being confident in ISO performance that I can go up higher and not worry.
Its not that I will push it hard enough in the high ISO range but to know its there is what is attractive. Like everyone i prefer to shoot in the lower rnage for IQ. I do shoot in a vast amount of situations and generally my shoots are not comparable in terms of light, which is the problem for most of us as photographers so having confidence that the camera will be able to deal with anything I throw at it is the main benefit for me.
Going back a few years the 40D was a game changer and did everything I wanted but now I am much more demanding and so are the clients so either cameras would be great! The 1Ds or the 5D MKIII just deciding which!!!

At the moment it is the 5D MKIII because of its size and relative usability to be an all round monster. But I always wanted a 1Ds and im sure we've all been there!!