Who do you think has the talent and the ability to pull off Beyoncé's classic "Love on Top" both in the studio and live (which yes, Beyoncé has in fact done plenty before)?
From a purely technical, vocal standpoint: Kelly Clarkson, Ariana Grande, Demi Lovato, and a couple others (Pink, Jessie J). They have the ease, vocal range, power, and agility necessary. However, I don't think they'd come anywhere close to capturing the magic of Beyonce.