Cannon Vs Nikon...Vs Sony

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In my previous discussion i ask for help from our friends here in my lot about which brand would better if i will buy my first professional digital camera. A few days ago i came to talk with a photographer walking around in a cafe where i was hanging around. I told him I was planning to buy a professional digital camera and and i told him my choices ( Cannon and Nikon ). But unfortunately he suggested a new brand, "Sony". At first i did not agree with him in my thoughts for i think Sony cameras are just new but he told that Sony is much better than Cannon or Nikon. So friends i need your help again. Is it Canon? Nikon? or Sony? God Bless You all...