Yes I know what you mean, actually he has some really good stats for a striker that does not start regular : 19Games 11Goals 2assist.
as he said, he runs like a doped bull and also fight for every meter on the pitch.
thats what lewandowski also does, but he also scores like a machine and have really good ball control and skill,thats maybe the big difference, hes quite skilful with the ball
I have to admit that lewandowski is really pure class, he is fast, perfect first touch, ball control, good header, nice finish... he is a complete striker and he would be perfect for juventus to be honest, he is the better version of vucinic I guess