The fact that he's doing it on pitches which aren't favouring the seamers is what amazes me. For example in Pakistan's 2nd innings of the 3rd test against India, when Pakistan were piling on plenty of runs, everyone was claiming the wicket had flattened out and India could draw the match etc. etc. Then Asif gets the ball for Pakistan and suddenly the ball is nipping in a mile and all the Indian batsman don't have a clue. Again, the SL pacers couldn't do jack all on the pitch, it was all Murali, yet Asif destroys SL.
He's a star in the making, and I think he'll do very well in England.