While the Cuntz-Krieger algebras of real rank zero were classified by Restorff in 2006, the classification problem for more general real rank zero C*-algebras with finitely many ideals remains wide open in spite of substantial progress in many special cases. We will show how Restorff's result generalizes to graph C*-algebras over finite graphs in a way also allowing one to describe in geometric terms when two graphs give the same stabilized graph algebra. In fact, the result does not require real rank zero and thus affords classification of the quantum lens spaces of Szymanski and Hong. This is joint work with Ruiz and Sorensen.