Not sure if it's known, but it's new to me so I thought I'd share.
KoreanAir, besides having some good redemptions on partner carriers, also has a partnership with 2 Hyatts. Hyatt Incheon, and Hyatt Regency Waikiki. It's 15k miles/night (standard room), which is a good bit less than converting UR to GP and using those to book the room. So if you're looking to go to Honolulu, pretty decent option.
KoreanAir, besides having some good redemptions on partner carriers, also has a partnership with 2 Hyatts. Hyatt Incheon, and Hyatt Regency Waikiki. It's 15k miles/night (standard room), which is a good bit less than converting UR to GP and using those to book the room. So if you're looking to go to Honolulu, pretty decent option.