Ronaldo, 34, arrived at Juve in the off-season after leaving Real Madrid as the all-time record goalscorer with 450 goals and 131 assists in 438 games across nine seasons.
This before he dominated in England with Manchester United, winning the Ballon d'Or once, scoring 118 goals with 68 assists in 292 appearances.
These staggering statistics rank the Portugal captain as one of the greatest goal-scorers of all-time and as he continues to defy the odds during the later stages of his career in Italy, the forward who has won five European Golden Shoe awards has made a huge claim about the Italian top-flight.
"Individually, things have been going very well, I've adapted to the Italian league and it's a difficult league, the most difficult one for me and for all forwards," he told DAZN.
"It's the most difficult league for me, it's full of quality players, I didn't expect so much quality in the Italian league, they're very good but I've adjusted well.
He continued comparing Serie A to LaLiga: "It's harder to score in the Italian league than in the Spanish league. The Spanish league is more open and the teams risk more.
"Here, not so much. Here the priority is to defend well first and then attack and that is no the case in Spain. Spanish games are more open. Always with most teams.
"The English league is the same, where I played for five years, is the same, it's harder to score in Italy, in my opinion."
Ronaldo has made 29 goal contributions in his debut Serie A season with 19 goals and 10 assists in 25 starts.