97 Points Robert Parker
The 2005 Cos d’Estournel is another great success from this property, which is owned by Michel Reybier. A superstar of St.-Estèphe in this vintage, this wine has a dense ruby/purple color, beautiful, sweet cassis and blackcurrant fruit, some floral notes, spice and a touch of oak in a full-bodied, layered, impressive multi-dimensional style. The tannins are surprisingly sweet and well-integrated, as is the acidity, alcohol and wood. This is a beauty and certainly the top wine of St.-Estèphe. Drink it over the next 25+ years.
Source: Robert Parker (Robert Parker Wine Advocate) by Robert M. Parker, Jr. January, 2015