I've seen a bit of Leipzig this season. Diomande has a lot of impressive attributes, but the fact that he's comfortable beating players on the inside or out is the most impressive for me. As he's comfortable rinsing his opponent in either way, it means that he is consistently dangerous regardless of which side he's playing on. Players who have the la croqueta skill in their arsenal are generally hard to dispossess, and he pulls them off regularly.
Who knows if that would translate to the PL, but going off his Germany and AFCON performances, he's worth taking a chance on for any club I think.