Napoli are playing very well, and it's no coincidence that they're in first place. The interesting thing is that Lukaku isn't missed, as Antonio Conte has managed to replace him admirably; in fact, the team is scoring goals without any problems.
All in all, it's going very well.
I think both teams played well. It's just that I noticed Napoli's defense seemed to be weaker than usual. But with the attacking strength they have, Napoli managed to win quite well. It was a result they really needed when facing a team that is not favored. Like last season, Napoli will be quite consistent and hopefully they can maintain it and defend their title again.