There was an interesting article posted earlier today, where Lee Sedol was interviewed after returning from the Nongshim Cup ([1]).
During dinner, after returning from Shanghai, he drank for a bit for the first time in a little while (apparently, it was
Kaoliang). He'd been drinking, so maybe he was drunk during the interview (that's my own speculation), but was quoted as saying:
내가 정말 화나는 일은 패배라는 결과가 아니다. (What I'm really angry about is not the fact that I lost.)
Rather, he said that though Ke Jie made some fatal mistakes, he (Lee Sedol) made more fatal mistakes. And if he (Lee Sedol) dwelt on that fact, he was really angry at himself.
나 자신에게 만족하는 바둑을 두고 싶다. (I want to play Go that is satisfying to myself.)
Lee Sedol always says, and it means that the various mistakes that he made during the game against Ke Jie were extremely painful.
When asked whether these same kind of mistakes would happen in his upcoming match against AlphaGo, Lee Sedol replied that he'd make similar mistakes. But, he declared:
그 실수가 오늘처럼 패배로 이어지지는 않을 것이라고 단언했다. 왜냐하면 ‘알파고’의 기력은 프로급이 아니기 때문이라고 했다. (Those mistakes won't decide the game like they did today. That's because 'AlphaGo' isn't really pro level.)
In a recent public interview about AlphaGo, it was brought up that AlphaGo had gotten to a fairly strong level, and they asked if AlphaGo could play evenly with Lee Sedol. To that he replied:
“선바둑이라는 말이 곧 프로급이 아니라는 뜻이다”라며 “선바둑이란 구체적으로 말하면 내가 ‘가지고 놀 수 있다’는 소리”라고 답했다. 선바둑에게 자신이 지는 일은 거의 없다고 했다.
("Just because AlphaGo plays evenly with me doesn't mean that it's at pro level. If you really want a detailed answer, playing evenly with AlphaGo, I'd be able to mess/play around (and still win)." There's just about no way I'd (Lee Sedol would) lose in an even game.)
He later said:
“사실 판후이 2단과 둔 기보를 보면 두 점 접바둑을 둬서도 이길 수 있다. 그러나 ‘알파고’가 매월 수만 판의 바둑을 두면서 스스로 학습한다기에 선바둑으로 높여 준 것”이라며 “하지만 그것이 지금 나를 이길 수 있다는 소리는 절대 아니다”
("Actually, looking at Fan Hui 2p's game records, even if I gave him a 2 stone handicap, I could still win. But even if you say that AlphaGo is playing lots of games every month, learning by himself, to raise to the level of playing me evenly, there's still no way AlphaGo could win.")
“정상급 프로기사들의 바둑에서는 계량화할 수 없는 ‘비틀기’나 ‘흔들기’가 나오는데, ‘알파고’는 이에 대한 훈련이나 감각이 없는 듯하다”고 설명했다. 말 그대로 기계일 뿐이고, 직관과 감각이 승부에 절대적 영향을 미치는 바둑에서, 지금 수준의 ‘알파고’가 프로를 뛰어넘을 수 없다는 것이다.
따라서 알파고와의 승부에서 자신이 5-0으로 승리하는 것은 당영한 일이니 행복한 결과이지만, 4-1로 이기는 것은 이변이며, 3-2로 이기는 것은 아주 불행한 일이라고 말했다.
("In top pro games, there are unquantifiable 'twists' and 'shakes' that aren't a part of AlphaGo's training or sense," He explained. Considering that, AlphaGo is just a machine; intuition and sense definitely have an influence on who wins the game, so the level of AlphaGo right now cannot surpass pros. Accordingly, in the upcoming match against AlphaGo, it's obvious that I'll win 5-0, so that'd be a happy result; but if the result were something like 4-1 or 3-2 (in Lee Sedol's favor), I'd (Lee Sedol would) be very unhappy with the result.)
Later, near the end of the article, Lee Sedol acknowledged that it'd actually be scary to play AlphaGo in maybe 2 years from now. So 2 years down the road, if he were given the challenge to play AlphaGo, he wouldn't do it for $1 million dollars - they'd have to pay him $3 million to play in that case

[1]
http://sports.media.daum.net/sports/gen ... _SPORTS=R6