I find the color rendering of my 5D and 1Ds3 (2005 and 2007 designs) to be slightly, but noticeably, different from new cameras. One quantitative difference is

I find the color rendering of my 5D and 1Ds3 (2005 and 2007 designs) to be slightly, but noticeably, different from new cameras. One quantitative difference is that there's less green sensitivity in the blue raw channel than modern sensors, which hurts their noise performance in warm lighting conditions. I'm not sure exactly how that affects color rendering in terms of metamerism, but it is visible in my experience.