I'm not one who bounces up and down saying how Serie A is so strong, but today was hardly a reality check.
Napoli's (2nd place Serie A) 2nd team lost 1-0 away to VIllareal (4th place in La Liga).
Fiorentina (3rd place Serie A) tied 1-1 at home with Tottenham (2nd place BPL).
I'd say that suggests all these leagues are on a very similar level.