Jesus isn’t the only one. Mary for starters was perfect.
Bear in mind, too, that there are different types of perfection. A thing can constitute perfection when it is the best OF ITS KIND.
A plastic cup can be a perfect plastic cup, compared to imperfect plastic cups. It’s not the same thing as a perfect crystal glass. But then if that crystal glass is IMperfect then the perfect plastic cup is more perfect, no?
Then too, perfection also relates to how well something fulfils the function it is designed for. A plastic cup is perfect to drink out of at a picnic or kid’s party, a fork or a shoe, or a crystal glass (even if it is a perfectly designed fork, shoe, or crystal glass) is in fact very IMperfect in this context - it doesn’t fulfil the purpose like a plastic cup does.