Sumeragi was a pretty powerful villain from Lost Song. His sword skills are certainly up there as one of the most proficient SAO characters. That being said, he’s still not quite good enough to take on Kirito. Kirito has taken on many powerful foes before including Sumeragi and he always comes out on top. Just as dangerous as Kirito’s speed and power is his drive to win. He won’t give up until victory is complete and 100% guaranteed. That’s just the kind of player he is. Kirito wins.