Who all has one? I know Amber does, but I'm wondering if there is anyone else? I am really hoping to upgrade to a full frame sometime in the next six months, and I keep reading about the 5D mark II's focus system needing to be upgraded, and how great the Nikon D700 is, so I'm seriously considering jumping ship. Does anyone have any opinions on the matter? Amber, if you read this, have you had any problems with your mark II?