Yes. God perfectly comprehends Himself (i.e., He knows Himself as much as He is knowable) because the power of God in knowing is as great as His actuality in existing (i.e., God is most cognitive because He is in act and free from all matter and potentiality).
Everything is knowable according to the mode of its own actuality. A thing is not known according as it is in potentiality, but in so far as it is in actuality. And God alone is pure act.