I use 1Ds with 35L now. I mainly shoot under Iso 400, sometimes go Iso 800
My question is: is it worth the upgrade into 5D II or 1Ds II when i only shot under ISO 400, is the IQ different between them under ISO 400? Should I upgrade?
I had both & long ago I had a 1Ds, and of the 3 I've kept the 1Ds2 because it fits my needs best. I'd really find it hard to believe there's a noticable difference in IQ between the 5D2 & 1Ds under ISO 800, or if there is I couldn't see it in my tests. Both make a nicer file than the 1Ds though, and battery life is way better too (on either of them). I'm not sure if any of this can help but I uploaded my test files into an album & any or all can be downloaded for inspection. They aren't really what you shoot but they might help.
You guys smoking something? The 1Ds had noise at iso 100. At iso 400 you had to expose perfectly otherwise you would get both noise and banding. The original 5D killed it for noise, DR, latitude, etc at every single iso and yes I owned and shot wedding with both of them.