They were two absolute geniuses of our Renaissance, but it seems that among Michelangelo and Leonardo did not run bad blood (see also https://www.pilloledistoria.it/12109/storia-moderna/michelangelo-lorenzo-il-magnifico).
According to what stated by Giorgio Vasari in The fast of’ Most Excellent Painters, Sculptors and Architects indeed, The two artists had disliked each other.
Precisely Vasari writes that “sdegnio was great between Michelangelo Buonarroti and Leonardo”.
The reasons we do not know them.
Normal rivalry between very large?
It is said that once the Buonarroti, crossing of the author of the famous Ponte Vecchio Gioconda, he had apostrophe with epithets anything but polite.
Leonardo, its part, in 1504 He reciprocated by giving the location of the negative opinion David in front of Palazzo Vecchio.
However, Luckily, his opinion was not decisive and the beautiful Michelangelo's sculpture was placed in the Piazza della Signoria (Photo gives: museiperlarte.com).