Yep 60fps here (with Vsync), Although I'm wondering if you'd need Voxel Global Illumination to get that lighting (and better reflections) in real time.
It might be just better to use voxels for additional layer of reflections.
(Screenspace -> voxel -> local-cubemap -> distant cubemap)
In this way they could get high frequency information where needed.
Voxels would give some occlusion information when screenspace information isn't available and when it fails the cubemaps would be sampled.
Also cubemap projected to voxels might be interesting way to get more texture resolution to voxels.
Purely as GI most implementations of VGI have only one bounce so the lighting in the room wouldn't be as good.