Great shot ! I could agree more with your statement, it's indeed high ISO heaven. Last May I was in Spain on a photography trip. One day I was sitting in a hide for little owls but they didn't came out until dusk. I set the ISO high without much hope, but when postprocessing I was really surprised about how good the pictures still were.
5DIII, ISO 12800
But even the ISO 25600 shot were still more than useable.
Since then I also bought a 1DX and that's even better a high ISO.
Cheers,
Mario