Checked into the Six Senses Uluwatu, Bali yesterday, and the welcome note specifically mentioned welcoming me as a Diamond member. I was somewhat surprised because I assumed Six Senses wouldn't recognise IHG tiers.

I don't know whether it was by virtue of being Diamond or just operational reasons, but I was also upgraded two categories from a Sky Suite (base level room) to the Cliff 1BR Villa, which was very appreciated. I don't think my corporate rate had any mention of including breakfast, but that also seems to be covered - again, not 100% sure whether it's a Diamond thing or not.

Edit: I just checked the Six Senses thread and it appears that at least some of these may be attributed to being Ambassador - not sure which between being Diamond or Ambassador matters more.