But how often do these "serious" strikes happen in open combat? Does anyone get a chance to swing as hard and fast as they possibly could in a situation like his and obi-wan's? He clearly attacked after obi-wan decided to give himself to the Force.
EDIT: And, yes. There are many other people credited with that level of speed (Starkiller, Sorasu Taalon, Mace Windu, Sidious, Luke Skywalker, etc.)
Lasers exist in stat wars such as I fives finger lasers which he states move just under 300 thousand kilometers per second and Vader has blocked them
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."