Be Careful with saying fast , as it doesnt always mean effective , Hatton was fast against Pacquiao , but was always running into punches. The best 140lb fighter is Tszyu and nobody considers him to be fast , yet the fighter he beat were all much quicker.
Honestly, Khan is fairly heavy-handed. A combination of lightning speed and good (while not overwhelming) power like Khan has is dangerous for anyone at 140-147.
That was the fastest I've seen him, yes. EDIT: The power was evident when he knocked Maidana down in round 1.
People will see 'ever' and immediately get on the defensive about past fighters but I do think Khan is up there in terms of speed for sure
I included "ever" on purpose in the headline. Seriously, I don't see how anyone at 140lbs could possibly be noticably faster than Khan.
Has Zab slowed down? in his fight against Floyd he looked the faster before he tired, so if Khan looked clearly faster than Zab from round 1 then he'd have to be up there with the fastest ever.