Paulo Sousa's side currently leads the way in Serie A and holds a six-point advantage over sixth-placed Napoli.
The ex-Empoli boss believes Fiorentina is worthy of its position at the top of the table, but wants the home crowd to produce an intimidating atmosphere when it visits Naples.
"Fiorentina are the only team that has dominated every game," Sarri said on Saturday.
"They have enormous potential. Last season they finished above Napoli and have won 4-1 at San Siro against Inter, and are also ahead now so they are stronger.
"It's the team that has more possession with the most successful passes and is most dominant. They are not first by chance.
"We are striving for continuity. We still have room for improvement.
"I would like the San Paolo to be hell for 90 minutes. We will suffer and they will have to help us."
However, Sarri still believes Scudetto holder Juventus is favourite for the title once again, despite sitting 12th after a poor start to the season.
"The overwhelming favourites are Juventus - it would be crazy to say they are not," he added.
"They remain a major force that can put together a winning streak."