Her, Keala, Hugh, and Zac have amazing voices! Michelle, Daniel, James, Ziv, and Skylar have great voices too. Austyn and Cameron have voices that are serviceable good for their age but nothing all that special. As for Zendaya, her voice is good in the movie, thanks to A LOT of highly noticeable overproduced autotune. Outside of the movie her voice is mediocre at best but judging by how she sounds in the movie (Despite how much noticeable overly-produced autotune her vocals were given), her voice was good but not great or anything special.

1.Loren Allred
2.Keala Settle
3.Hugh Jackman
4.Zac Efron
5.Michelle Williams
6.Daniel Everidge
7.James Babson
8.Ziv Zaifman
9.Skylar Dunn
10.Zendaya (But outside this movie she'd be in last place)
11.Austyn and Cameron equally