As a significant Churchill fan the comparison between him and Johnson is completely odious. Churchill and Johnson were both journalists with great skill with words. There the comparison ends.
Churchill is a man who was a near perfect war leader. A man who could compromise, build agreements with other politicians not on the same side, lead a unity government and face down some of the more Conservative and regressive elements of his class to permit the country to survive. He is a visionary man in that sense. He gets on a plane in the middle of a war in horrendous times to chum up to Stalin and drink vodka. Anything to preserve the country. He sets in train a number of eccentric projects to save Britain and spends his time in every diplomatic effort to get the country money when its starving for funds and arms, he persuaded the US to support us, he gets De Gaulle to London, he lives under the Cabinet Office in an underground bunker that is cold and filthy, and finally gets rid of men like Halifax who would have negotiated with Hitler and let Europe be razed by the Nazis.
Johnson is a lazy arse. He wrote his own history because no one else would bother.