What is perfect salemanship?

One week ago, One of my friend decided to purchase a 21" Color TV for his home. He is already having one samsung TV and want another for his drawing room. When we met in a satuday night he told me about his decision. He told that he was going to bought another samsung tv . After some time , we finished our dinner and we four friends who are highly educated and MBian have decided to go to Mohan Lal market to purchase the TV and all are decided to bring the Samsung TV.
When we entered into the showroom, one salesman showed us different kinds of TV of various manufacturers and the salesman was so smart that all are decided to purchase the Panasonic TV.
He convinced all of us so smartly that our decision went into the favor of Panasonic. He compared all the TV so smartly that all of us decided to GO for panasonic with a higher rate. When we brought the TV into his house and compare the TV with exisiting Samsung TV we felt samsung is better than Panasonic.
We all saluted to this salesman that if he can changed our pre-determined mind of all of us MBians then how smartly he can sell the things to other people? Whenver I visit to my friends home, I salute the salesman and tortured my friend that if you are a marketing man , and you can divert your decision after hearing such woderful words of a salesman than other people have no option to hear him.
This is true salesmanship.