Michelangelo vs Leonardo

Tondo Doni, Michelangelo, 1508

Vergine con il bambino e Sant'Anna, Leonardo

Michelangelo believed that painting should approach the sculpture. His painting technique can be described as statuesque. The subjects of his paintings are well defined and appears impermeables.
Leonardo, instead, thought the painting would approach the reality, and because between one thing and another there is never absolute void, the figures were to fade and lose one another and with the background, so porous.