This looks pretty incredible! As others have mentioned before, the color will need a bit of work in post, but with the EXRs that won't be a problem (though I'm curious how hard it would be in TG). Also I'm a little concerned about rendering of such complex objects, including humanoid, in a native TG animation. Will the characters be moving, and are you then using object sequences?
Regarding render times, I've just spent a while doing a lot of tests on a complex, challenging render time problem for Tangled-Universe. I'd be happy to check out your scene and see if I can bring down render times further, if you'd like. Of course you would need to Gather the entire project and archive it for any such optimizations to be done correctly. I'm sure you've done plenty of your own work on finding optimal settings as well.
- Oshyan