From the oldest model I could find I own, to the latest one I have finished.
Nobody is born paintbrush in hand.
Standard Troop
1993 Blood Angel 2nd Edition model -> Sanguinary Guard, 2010.
Characters
1994(?) Corbulo -> Marneus Calgar 2010.
Tanks
Alpha Legion predator 2006 -> Blood Raven Predator, 2009.
(Sorry, all my old old old tanks are in deep storage in a storage facilty, i'll see if I can find them sometime)