Alexis will have a much better season than Hazard. He was forced to change his playing style at Barca. They have had Iniesta, Messi, Neymar to beat players, Cesc, Xavi, Iniesta and Messi to make the final pass. Alexis' role was more to do with off the ball movement and finishing (like Pedro), which he had to adapt to, because at Udinese he wasn't a finisher, he was a creator. Despite that his goal return has been pretty decent.
Wenger will get the best out of him. There are a few players at Arsenal that want to dribble high up the pitch, bar Oxlade at times. He will have freedom to do that and completely outshine Hazard, who imo has been nothing but hyped up by Chelsea fans/Belgians. It will take the spotlight off Ozil and help him perform too, so yes I would say our attacking midfield is light-years ahead atm.