Are you really still impressed by their performances? They have played the first leg against Frankfurt so brutally effective and strong that this performance didn'T surprise me whatsoever. For me personally they are one of the favorites for the Champions League title by now without a doubt. They are too constant to be underestimated now. It's not a team that had some lucky games over the course of the season. They control every single game and the few points they lost in the Serie A wasn't because they were the weaker team, it was just because things didn't play out that well that day.
Now let's see who they are going to face next. But I am sure no matter who the opponent is, none of them will be happy if their draw turns out to be Napoli as the next opponent.
For Napoli, everything can end as soon as Bayern or City become their rivals, but Real and Benfica are likely to be able to beat them in the same way. I'm still very skeptical about Napoli in the Champions League, although I agree that Spalletti managed to make Napoli a very good team. We do not have to wait long, tomorrow we will be able to find out all the couples for the 1/4 finals.
I am absolutely convinced that Bayern would be as concerned playing against Napoli as they would be when they were to play against Real Madrid or City. Napoli is no mediocre team this season. They are brutally well organized in their game. Nobody is pulling off unnecessary ticks or experiments. Everyone sticks to their role on the pitch and fulfill it with 100% dedication and precision. I have hardly seen a team that plays soccer so disciplined as Napoli is playing this season. You just can't create chances against them, and if you do be guaranteed that they are perfectly set up to counter your attack successfully. It is impressive to watch their games.