I feel any camera without a CF card slot is not a pro camera ( Dual SD in the D600 ) . That being said the cheap SD cards are killing CF card sales . I thought the D800 would carry over the D200 - D300 battery / USB cable / NEF file readability in editing software . NO luck there .
The plus on the D600 is a smaller file size would be easy on computer processing and storage . I doubt if 2% of all photographers ever print over 16 X 20 , so you just gain crop area with a D800's extra large MP sensor .