I was wondering how many GB's your CF card is in your 5D Mark II? I currently have sandisk 8gb and a sandisk 16gb, I mostly use the 16, I am wondering this because a couple of times i took photos at a high school basketball game and it filled my 16gb card. I am also taking pictures in raw and jpeg at the highest quality.
So please tell me what you are using. If you are using a 32gb or a 64gb are you having any problems with it being such a big card?