Sonny Vaccaro -- a LEGEND in the shoe brand industry -- says he'd offer Zion Williamson a $100 MILLION endorsement deal ... telling TMZ Sports the Duke star deserves more than what LeBron got out of high school.
"There are particular, singular athletes that can move the needle," Sonny says ... "Zion Williamson has moved the needle before he even became a professional."
Of course, LBJ currently holds the record for biggest shoe brand contract ever given to an NBA prospect ... scoring a $90 million deal from Nike before he took the court for the Cavaliers in 2003.