Berbatov struck twice in victory over West Bromwich Albion on Saturday.
Sidwell, who scored the third goal in the 3-0 win, said: "You look at that season he played the year before last. He was top scorer for United. He's always calm and collected. He brings the best out of everyone else."
Martin Jol thinks Berbatov is the best striker the club have ever had. Does Sidwell agree?
"If he carries on playing the way he did today, he's got every chance of fulfilling it."