Freddie and Roger both recorded demos, as the band was split over who should get lead vocals on the song before deciding Freddie would do the intro and Roger the main part of the song. As far as I know, the Freddie demo has yet to leak.
Honestly, after listening to some of the live versions of the song (in which Freddie always had lead), I actually prefer Roger's vocals on it. Can't explain why in too great of detail; his voice just seems more suited for it.
"Do you think I should keep this mustache? Did you say no? F--- off."