Upload & Sell: On
I am in exactly the same position as you are. I'm torn between the 1Ds Mk III and 1D Mk IV. I shoot a variety of subjects from landscapes/scenics, macro, wildlife, birds, some portraits, some sports etc.
I love the IQ of the full-frame cameras esp for macro work and the D.O.F. I also love the 10 FPS of the 1D Mk IV, (sounds so cool, and may cause some nearby attractive photographers/lookiloos of the female persuasion to inquire about it, or take notice) plus it's a newer body, and has a brighter rear LCD screen. (My eyes ain't what they...Show more →
I'm close to having saved enough to purchase a nice 1DsIII. Currently it appears that no one will pay more than $2300-$2400 for one and it has to have everything with it. From your description, I offer this nickel's worth of advice. The 1DsIII would probably serve you better. I got the 1DIV because my sports work (which is paying far better than the landscape and "art") demanded the thru put and the high ISO. To swing the 1DIV purchase I had to sell my 1DsII which I sorely miss.
The FF, AF, and IQ of the 1DsIII is superb. Those who have just purchased 5DIIIs will dispute this but other than much higher ISO and better thru put, I don't think it really has anything on the 1DsIII's image quality. Again, the 5DIII being newer will have better bells and whistles (including a higher rez LCD).
Frankly if you don't need 10 FPS and fairly good ISO 6400, I can't see the 1DIV giving anything you need and there is no doubt - based upon the limited tests I've done - that the 1DsIII creates a better image.
Again $0.05 worth of advice, but it's where I'm headed.