I do not know how you can separate a law that is perfect from the people who follow the law perfectly.
Psalm 19:7
The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple.
James was sure that the way to learn about perfect was looking at the perfect law and not only looking but a doer
James 1:25
But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.
Paul was sure that the indwelling of the spirit of Christ was possible and would bring about the perfect man.
Ephesians 4:13
Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:
Obviously Paul though it was possible
Colossians 1:28
Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus: