It is pointless to compare Del Piero to Ibrahimovic.
Zlatan is a good player. He is having a terrible time and I hope he gets over it soon.
Zlatan is now ~24 years old right? He has a long future ahead of him.. BUT he is not mature yet. That is Zlatan's biggest problem. Getting stupid red cards, making fun and disrespecting other players for managing to score a goal or dribbled past another player. Zlatan lacks the respect to the opponent.. I wouldn't be surprised if Zlatan would pick up a fight in a CL final. Arogance won't get him anywhere... Zlatan impressed on him first season, and with the help of Capello, he beleived that he is better than anyone.. That he can do whatever he wants when he wants.
The reason you cannot compare Del Piero to Ibrahimovic is becasue at the age of 19 Del Piero was much more mature than Zlatan currently is. Whether its behaviours on the pitch or off the pitch.
And for those who were comparing acheivements, you really cannot compare Juventus all time legend and top scorer to a player who is good, quite good, but in nowhere near the level of a Juventus legend.
And for those who are trying to refer to DP's career to only have shined in 1 season.. well.. I really don't know what to answer them. It seems that they really haven't been watching football.