According to Catholic Catechism # 508, Yeshua was not the only perfect/sinless person ever to walk the earth. In fact, Catechism #508 states that Mary was born without original sin then goes on to state she never sinned while on earth.

Catechism #508 –  From among the descendants of Eve, God chose the Virgin Mary to be the mother of his Son. “Full of grace”, Mary is “the most excellent fruit of redemption” (SC 103): from the first instant of her conception, she was totally preserved from the stain of original sin and she remained pure from all personal sin throughout her life.