The above statement also mean there is someone who is perfect
NO. The only thing that you can infer from the above statement is that "There exists someone whose is not perfect."
It may be the case that everybody is not perfect.
This is one of the reasons why plain English is not used for mathematical relations, which tends to lead to ambiguity.
$\neg \forall (x) P(x) \implies \exists (x) \neg (P(x))$