The volume of singular K\"ahler-Einstein Fano varieties

We show that the anti-canonical volume of an $n$-dimensional K"ahler-Einstein $\mathbb{Q}$-Fano variety is bounded from above by certain invariants of the local singularities, namely ${\mathrm{l}\mathrm{c}\mathrm{t}}^n\cdot \mathrm{m}\mathrm{u}\mathrm{l}\mathrm{t}$ for ideals and the normalized volume function for real valuations. This refines a recent result by Fujita. As an application, we get sharp volume upper bounds for K"ahler-Einstein Fano varieties with quotient singularities. Based on very recent results by Li and the author, we show that a Fano manifold is K-semistable if and only if a de Fernex-Ein-Musta\c{t}\u{a} type inequality holds on its affine cone.