The Vulgate, or Versio Vulgata (”commonly used translation”) is the Roman Catholic Church’s official Latin version of the Bible as translated by St. Jerome in the 4th Century. It is not the vulgar or common man’s language, whatever that means.
The KJV is a translation in Elizabethan English. It has errors in translation, the most seasonally famous: “Glory to God in the highest and on earth peace, good will toward men.”
The correct translation (Douay Rheims): “Glory to God in the highest. And on earth, peace to men of good will.”
Elizabethan English might sound lyrical to our modern ears but it was how the English commonly spoke in the early 17th Century.