Sweet thread. Hope to hear from a lot of people, always looking for best upgrade value proposition options:
All mine are from an upcoming trip late Feb/Early March 2019.
PH Beijing: ~$250/Night, Penthouse Suite
PH Seoul: ~$275/Night, Diplomat Suite
PH Tokyo: ~$625/Night, Diplomat Suite
P.S: Enjoy your PE Suite at St. Kitts, we stayed in one back in November and loved it.