There is at least one other case of a person who could pierce copperclouds. In her case, however, the situation was slightly different. She was a Mistborn from birth, and her sister was the Seeker. The death of that sister—and subsequent inheritance of power via the Hemalurgic spike used to kill that sister— left her twice as strong at burning bronze as a typical Mistborn. And that let her see through the copperclouds of lesser Allomancers.
