The 66-year-old feels Antonio Conte's side made a leap of faith in their rout of the European champions, but added that Serie A is not as strong as it was in 2005
The Bianconeri recored an impressive 3-0 win over the European champions on their way to winning the group, and Capello feels the result and the performance could be the catalyst for further success for Antonio Conte's men in 2013.
"Juventus have a solidity and continue to be very convincing. Conte is doing a very good job," he told Gazzetta dello Sport.
"I think the turning point of the season coincided with a clear victory over Chelsea. The team made the leap, even in terms of belief.
"This team has people that make the difference. [Mirko] Vucinic, [Gianluigi] Buffon, [Giorgio] Chiellini, [Andrea] Pirlo."
Juventus' 3-1 win over Cagliari in their final game of 2012 saw them accumulate 94 points over 12 months, surpassing the record for a calendar year set by Capello's side in 2005.
However, the 66-year-old believes his side cannot be compared properly to Conte's as Serie A was more competitive during his tenure, adding that the sanctions imposed upon Napoli further undermine the current state of the league.
"The league was much more combative [in 2005], there were at least five teams equipped for victory," said Capello.
"I would like to clarify that in the table Napoli were docked two points for the events of Scommessopoli. A decision that affects the fight for the Scudetto for the events that occurred in 2010 does not seem right."
A resurgent AC Milan have been linked with a move for Didier Drogba recently, and while Capello believes the Cote d'Ivoire star could be a valuable addition to the Rossoneri, he insists there remains only one side who can stop the Old Lady from reclaiming the title.
He added: "A guy like Drogba can make the difference. However, for me the only team that on paper is troublesome to Juventus is Roma."