I would love to see more statistics on this, but the Chosun Ilbo has data from a survey done in Taiwan that shows the top three coffee chains in South Korea are Starbucks, Dunkin Donuts, and Coffee Bean. The article is ambiguous because it doesn't say how, exactly, they're ranked. By number of customers? Revenue? Customer satisfaction? Popularity in a particular survey? Well, anyway, in Taiwan, the order is 85℃, Starbucks, and believe it or not 7-11 City Cafe. We read a little about Dunkin Donuts in Korea a few days ago.
In a timely turn of events, Zagat has released results of a survey that shows Starbucks has the best coffee in the US among fast-food chains. You can check the rest of that survey out here.
And in other news that turned up searching for "Starbucks" and "Taiwan," it seems that last week Starbucks was in some trouble over there because the website listed Taiwan as a province of China. As for a naming controversy closer to home, the map calls it "Sea of Japan" with "East Sea" in parenthesis.