Is there any real reason a D800 shooter would prefer a CF card over an SD card? I've a ton of very fast SD cards from owning a D7000 but my CF cards date back to my D70s, which I'm sure are far too slow for the D800. In addition, the CF cards tend to be +2x the price of SD cards. I realize that the bulk of D800 owners are former D700 owners and the CF storage is a "legacy" addition (according to Nikon) so is there any reason I should belly up for the more expensive CF cards over SD cards short of just having a second card available?