Scientists have concluded that a human clone would feel a sense of individuality and would not become a copy of the person cloned. They based their conclusions on interviews of identical twins, but acknowledged that clones would be born several years later than a twin. Given the shortage of clones to interview (i.e. none), twins make the best substitute.
Clone ‘would feel individuality’ http://news.bbc.co.uk/1/hi/health/5187990.stm