II Chronicles 32:24-26

"In those days Hezekiah was sick and near death, and he prayed to the Lord; and He spoke to him and gave him a sign."

"But Hezekiah did not repay according to the favor shown him, for his heart was lifted up; therefore wrath was looming over him and over Judah and Jerusalem."

"Then Hezekiah humbled himself for the pride of his heart, he and the inhabitants of Jerusalem, so that the wrath of the Lord did not come upon them in the days of Hezekiah."

(That shows that Hezekiah may have been a great king, but he was no perfect king. He still made mistakes, still sinned. Josiah would be the same. Jesus alone did not sin of all these kings.)