As someone already said, not only his looks and his body are quite comparable to Kaka but also his playing style.
Think of Kaka with worse dribbling skills and slightly worse passing.
The last point is where I have to to disagree with
@Zehner and his "a modern type of Özil" statement.
As much as I don't like Özil, I still think that his passing and vision are absolutely incredible. And in my eyes Havertz is only "good" in this regard.
He's a big talent obviously, but for me he is bit overrated.
But this may also be due to the fact that i dislike most players with a body language and attitude like him.
I think Liverpool could spend that money way better.