I don't want to get into a pissing contest but just to point out there are people equal of him in the versatility and greatness, such as his great rival Michelangelo, who is also a great sculptor and great architect. Da Vinci's work as a field engineer impugns his character as a shiftless ingrate who laid siege to his home city that did nothing but adoring and honoring him. Compared to Michelangelo, who grew up poor and labored under severe constraints, Da Vinci had a much easier life.