The German champions have one foot in next month's final in Wembley after destroying Barcelona at the Allianz Arena.
Thomas Muller's double and a goal apiece from Mario Gomez and Arjen Robben earned Bayern a healthy advantage to take to Camp Nou next week.
Lahm admits Bayern targeted Barcelona's weakness in the air with two of their goals coming from set-pieces and the full-back hailed his side's defensive display to restrict the Spanish side to one shot on target throughout the 90 minutes.
"Of course I can comprehend what happened. We have the potential to beat any team," said Lahm.
"It's well-known that Barcelona have problems in the air. Defensively we were close to perfection, that was the key."
Bayern winger Franck Ribery believes their hard work in the game paid off and he was always confident they had the players to score against Barcelona.
"To get such a result, we knew we had to work together," noted Ribery. "Apart from that, we knew we had a striker who could score."
"We're very happy. There is one game left but I think we performed well tonight."