I am looking at switching to a 1DMk2 from my 20D but I have one question. I shoot paintball for a few websites primarily so I like the speed of the 1D, but in my spare time I shoot a variety of things(automotive stuff, studio stuff, and recently landscapes and live music).
Am I going to notice much, if any improvement in image quality? What about high ISO performance? Like I mentioned, I have started shooting music recently and 1600 is going to be used pretty frequently. I know the 5D and MK3 are much better in that respect, but for all around use, and my current financial situation, the 1D fits me better.
Thanks!

