Indeed very tight as most of the top teams win their games nonstop or at least they don't lose them. Lazio has been doing amazing and so has Atalanta, Inter and Fiorentia, which is probably the biggest surprise of them all as I rather saw them further down the table. But anyway they are all playing their best and the results are on point, which makes Serie A interesting to follow these days. But let's see who will first have a real break in their winning streak (or not losing streak for that matter), but so far they all look strong.
This is the first time I've seen such intense competition on series A like today. Those teams you have mentioned have won 5 consecutive matches. They only left 1points from 1st standing, Napoli. I guess This fierce competition will take place throughout the seasons because they show stable performance at the beginning. maybe we'll see a new team that can rise in the midst of competition. A club like Juventus is still trying to reach it. And it's not impossible, Juventus will become their competitors on Scudeto if the top 5 clubs experience defeat in the next week.
I feel that Seri A today has become a league to be reckoned with. there are many great players come from series A and competes fiercely with top league like premier league and la liga.