This could be motivated thinking/speaking though.
The English commentators seemed to take a significant time to come up with score estimates, to the point where I think they were genuinely uncertain in a way that AlphaGo wasn't. (What would be interesting, for example, would be to look at AlphaGo's estimation of the score of historical tournament games that had commentary and see how well the two track each other.)
Myungwan Kim seemed to be quicker to reach the right conclusion - IIRC, by the time that the fighting in the lower right corner ended, he was pretty sure of AlphaGo winning, to the extent of guessing that a move that lost AlphaGo around 1.5 points down there was because AG would win anyway.
There have been a couple of brief discussions of this in the Open Thread, but it seems likely to generate more so here's a place for it.
The original paper in Nature about AlphaGo.
Google Asia Pacific blog, where results will be posted. DeepMind's YouTube channel, where the games are being live-streamed.
Discussion on Hacker News after AlphaGo's win of the first game.