St. Regis Osaka

Early check in: Available, used around 2:45pm.
Room Upgrade: From Grand Deluxe Twin to Grand Deluxe King. Kind of nonsense.
Amenity: 100 USD F&B. All alcohol excluded. Minibar excluded.
Late check out: Requested and used 2pm departure.
Breakfast: Breakfast Buffet.

Conrad Tokyo

Early check in: Available, used around 2:00pm.
Room Upgrade: From Regular City View to Executive City View.
Amenity: 125 USD (conversion done at check out). No restrictions.
Late check out: Requested and used 1pm departure.
Breakfast: Breakfast Buffet, Executive Lounge or Room Service (not sure if/how this differed from regular Gold breakfast benefit).