I had my first flight with CX last week and I was surprised I was the only one in the first class and I had transpacific flight from HK to LA. The plane was almost full but I was so lonely in flying with the first class there and I planned on flying back with CX again and would not like being the only one there!
Maybe it was such a day though it is very common the first class not to be crowded even on more famous air planes such as AA for example. Anyway if you dislike being that lonely flying with first class at CX than I advice you book the economy class there for you wont be lonely that much there I bet.