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In this paper, we consider a symmetrization with respect to mixed volumes of convex sets, for which a P\'olya-Szeg\"o type inequality holds. We improve the P\'olya-Szeg\"o for the k-Hessian integral in a quantitative way, and, with similar arguments, we show a quantitative inequality for the comparison proved by Tso for solutions to the k-Hessian equation. As an application of the first result we prove a quantitative version of the Faber-Krahn and Saint-Venant inequalities for these equations.
Masiello et al. (Tue,) studied this question.