The Portuguese giants defeated PSG 1-0 at home on Wednesday and now have six points from two matches in the group.
"Porto are the favourites to win [the group] because they have more experience than us, but we were able to trouble them," Ibrahimovic is quoted as saying by UEFA's official website.
"I think we're learning every game. It's our first time in the Champions League for a long time and it's a different game compared to other [competitions].
"I think [PSG goalkeeper Salvatore] Sirigu had a fantastic game. If the team as a whole plays well, we can go a long way."
PSG are currently second in Group A with three points, as many as Dynamo Kiev.