It's pretty sharp and powerful, and he uses it well, but there's something about the way he throws it, and his shots in general, that I don't like. A lack of compactness for want of a better word. He just seems a bit open to counter shots, though no one's had the skill to exploit it yet (if it is an exploitable flaw).
Pulev has a very good jab, very fluid and can cause some damage over the long haul. My question is if his style is centered around his jab and movement, can he beat Vladimir Klitschko at his own game. Pulev seems to wear opponents down with his jab but Vladimir Klitschko can end a fight early and he can bring full leverage from his left side i.e. devastating left hook so he has 2 more effective punches than Pulev. I think Pulev can actually punch harder than what he has shown in his fight but IMO he sacrifices leverage and weight for speed and mobility.