The 2020 Cos d’Estournel has a deep garnet-purple color. It is very closed at this youthful stage but with much shaking it opens out to vivacious notes of crushed blackcurrants, juicy blackberries, kirsch, and cinnamon stick, plus suggestions of star anise, lilacs, and crushed rocks. The medium-bodied palate shimmers with energetic black fruit and mineral layers, supported by fine-grained, beautifully ripe tannins and seamless freshness, finishing very long and fragrant. A very elegant expression of Cos, and absolutely beguiling!

98 points, The Wine Independent (March 2023)

Brilliant, just so much complexity and depth. The serious tannic heft means this is not the most exuberant Cos d'Estournel but it is such good quality, with edges of violet and peony alongside black tea, turmeric, cloves, blueberry, raspberry, waves of confident tannins, and sea-salted bitter chocolate. Harvest September 10 to 24, 39hl/ha yield, 3.9ph.

97 points, JaneAnson.com (January 2023)

The 2020 Cos d'Estournel is a wine of extreme elegance. Silky and light on its feet, the 2020 is incredibly nuanced. In fact it is without question the most finessed of all the top wines in Saint-Estèphe, showing more in common with some of its neighbors in the north of Pauillac than the more potent wines of Saint-Estèphe. Impossibly soft, silky tannins wrap around a core of dark red fruit, spice and orange zest. The 2020 is not a huge Cos, but rather a wine for readers who appreciate elegance over power. I can't wait to see how it ages. Magnificent.

97 points, Vinous (December 2022)

Based on 62% Cabernet Sauvignon and 38% Merlot, the deep purple-hued 2020 Château Cos D'Estournel has, dare I say, an almost Lafite-like sense of elegance and class, offering gorgeous cassis and darker currants fruits as well as tobacco, lead pencil, acacia flowers, and graphite. Hitting 13.46 alcohol, with a pH of 3.9 and an IPT of 80, this flawless, full-bodied, incredibly elegant Saint-Estèphe has silky tannins, perfect balance, and a great, great finish. It will need a decade of cellaring to hit its prime drink window. Of the trilogy of 2018, 2019, and 2020, it's clearly my favorite (that’s splitting hairs), with a similarity to the 2016, and will most likely merit another point at maturity.

99 points, JebDunnuck.com (March 2023)

The 2020 Cos d'Estournel, which was bottled in July, has lost some of the exoticism that it showed out of barrel. Within five minutes of aeration it develops a complex bouquet: black fruit laced with graphite and subtle cedar aromas, a charcoal back-note and later pressed iris flowers. I foresee this gaining more nuance with bottle age. The palate is taut, lean and precise. Lightly spiced on the entry, with finely-chiseled tannins, again, not quite as precocious as it showed in barrel, allowing the terroir to come through more. There is something almost understated about this vintage vis-à-vis others, razor-sharp precision with just the right amount of salinity on the finish. This is a classy offering that will mature beautifully in bottle. A keeper.

97 points, Vinous (December 2022)

The 2020 Cos d'Estournel is a bold, demonstrative wine, bursting with aromas of cassis, dark berries and plum liqueur mingled with exotic spices, burning embers and petals, framed by a generous application of creamy new oak. Full-bodied, broad and low acid/high pH in style, it's rich and extracted, with a layered, mid-palate and a long, clove-inflected finish. While it isn't anywhere near as extreme as the 2009, the 2020 does appear to mark a move back toward a more turbo-charged style after Cos d'Estournel's shift toward elegance, exemplified by the brilliant 2016—but perhaps that's merely an illusion created by the vintage?

94 points, Wine Advocate (April 2023)