Lesse here. Newt the Utada songs you've posted for me are both good. That being said, so far she hasn't given me life with anything. It's just average goodness. Ayu is still miles ahead of Hikki in terms of better music
And also vocal ability based on what I've heard of her singing in the three songs you've posted for me (Come back to me, Stay Gold, and Traveling, and also that Boulevard of Broken dreams cover). She sings well, but Ayu's best vocals > Utada's best, no?