Friend of mine asked me to post this question here so if all inputs are welcome..
"Currently I own a 1d mark 2 and I am thinking of upgrading to one of these two models. Basically my current camera is not satisfying my needs since I mostly do weddings (Europe) which are rally dynamic and fast (dancing etc) ISO is my main problem with this one.
So I would like to ask current owners of these two models to give me a hand and make the decision easier to me."