Lecresia Campbell can. She is naturally an alto, but she can sing first soprano easily and she can hit notes that most soprano's can't.
Karen Clark Sheard who is naturally a soprano...she sounds just as good singing alto.
The lady who sings Order My Steps sings, soprano and she sounds excellent singing alto.
Lorraine Stancil, lead singer on the original "When We get Over There" by Hezekiah Walker, sings first soprano and sounds excellent singing alto, tenor, and bass. Yes she can go as low as a bass and she sounds really good singing that low.