I stayed at the Hilton Nagoya and Fukuoka while there last week. Both were nice hotels. I had a suite upgrade at Nagoya which was great and rate this the better hotel apart from the executive lounge and breakfast.
Exec lounges at both were similar but both the buffet breakfast and the evening canapés in Fukuoka were far superior.
The Nagoya breakfast area was very crowded with a wait to get in. They seem to limit the number of people despite having free tables simply to minimise the crowding around the food.