My own comment to my friends somewhere else...
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Of the many vintages tasted, the ones that made the deepest impression on me:
1. 2005, for me it's very good already, and enjoyable now.
2. 1982, I don't have many experience with old Bordeaux, but a few older ones I tried felt flat and mellow. But the 1982 Cos I tasted was still full of vitality (I don't know if this is the proper wine term, but in Chinese 非常有活力).
3. 2009, lots of stuff there. Maybe this is what the American called a "Big Wine", because it remained me a wine I bought in Sonoma. I think the 2009 is not over rated quality wise.
4. 2003, people around me liked the 2003 better than the 2005, but not me. I wonder if I am too used to have strong tea, thus tannins does not bother me too much?!
5. 2008 Cos d'Estournal Blanc is very enjoyable. I don't usually like to drink white wine, and this one is good.
The 2010 for me is a bit sour, the back of my tongue felt a bit sharp like drinking soda. The 2011 has strong rough tannin, felt not integrated yet. Maybe like MaJeff said, it's simple too early.
For me all the vintages tasted were good, and if not because of the comparison right there, I would take any of them (maybe except the 2 new ones) any day.
I don't own any Cos d'Estournal at the moment other than a few bottles of 2009.