updated with the set I worked on these days. Not claim to be 100% accurate, 'cause I followed him live only in CL, while I watched a lot of clips of him in UPL.. there's a channel who posts clips of him against every team he plays against http://www.youtube.com/user/SMcomps
If I have to make a comparison, the first player who comes in my mind is Marek Hamsik. Italian press compares him to Marchisio, thing that I'm not that persuaded about. He's a classy dribbler, a "talisman" one, capable of take all the team on the other side of the pitch just wandering with the ball. Pretty nice ds, and not so much agile, but really effective thanks to the speed. Almost ambidextrous even if he doesn't use so much his left foot to be considered one.
He probably needs B2B too