Interesting and timely thread for me as I am debating which body is next. I have 1DsMk3 and 5DMk3 bodies. My work has a mix of needs, but no sports or birds, wildlife. Events, yes, architecture, real estate, hospitalty, portraits. I like to use lights. So I have a vision of two of each, so when I go to anything I can put two of the same bodies on me so the control features are the same during that session. I pick the kind of body the assignment calls for. I know Canon might throw a monkey wrench into the works by tempting me later this year with some new body, but that's the working plan.
Good to hear others' ideas/suggestions about the contribution and capabilities of older tech.
Yes, I am always aware of 1DsMk3's ISO limits but the other stuff is sweet. Got the 1Ds in late February so feel I am still getting to know what it can and can't do. I love the solidity and its shutter sound. It just feels like a real camera. But to be sober about the realities of "gear" this 1d may have a slightly flaky USB circuit board. So multiple bodies are a must. Best to have two of each in case one fails.