I did a search and could have missed a topic like this due to my wording in the search. Sorry if I have.
I currently have a 5D MK I and with the arrival of the MK III I am thinking about updating to either the II or III. I mainly shoot: high school sports, portraits, landscapes, and am NOT looking to upgrade so that I could shoot video. Since I do not have access to either the MK II or MK III, what would be YOUR reasons for upgrading to the II, III, or staying with the I?