"The 2005 Chateauneuf du Pape is inky blue/purple in color, full-bodied, structured, with noticeable acidity, high tannin, and a Bordeaux-like structure. This is a backward, formidably endowed Chateauneuf du Pape that is going to take 5-6 years to round into shape, and last for 15 or more years. This is one more estate that has come back strong because of a change in generations with the young, competent Jean-Marc Diffonty replacing his father, one of the grumpy but personality-filled characters of Chateauneuf du Pape. Yet from a winemaking standpoint, the father was inflexible and unwilling to change. Diffonty has lower yields and introduced a new blend, the Reserve Sixtine which is a blend of 50% Grenache and the rest Syrah and Mourvedre, the latter two components spending time in small oak barrels."
-Wine Advocate 90-92