What a smooth picture like that!!
The "untouched" picture you linked to is not untouched, the crazy noise has been added afterwards. If you look at the DPReview gallery for DP2, which should have more noise, you can see that the pictures look fine even at ISO800, see
The look in those pictures can be achieved with aggressive noise reduction, and resizing the images smaller. They also have extreme high key and desaturated processing to enhance the look. (Google "high key" if you're not familiar.)
|Hot Air Balloons Over Bagan by User9320321874|
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)