Dammit, I am under.
But while the song by Rachael Leahcar has garnered the most press, the performance that had me hitting the rewind button over (and over) again was this one, by Paula Parore:

Her delivery, that composure... those lyrics {"But don't you remember? Don't you remember? The reason you loved me before. Baby, please remember me once more."}
I am going to say something a little controversial: her delivery is more moving than Adele's.
It certainly had Seal in, er, raptures...
Deeply moving rendition, especially considering her backstory: she is legally blind, and has overcome her setback to triumph with her magical voice.
And then there was Karise Eden (what? Only 19?):
And the amazing Laura Bunting's rendition of Kate Bush's 'Wuthering Heights':
And the eyeliner-loving Jimmy Cupples and 'Woman':
Who is your fave so far? Are you hooked too?
Pic of Paula Parore: Perth Now