a place called The Mon in Causeway Bay is excellent.... 4/F, The Goldmark. not really a fan of Wasabisabi.. although it is meant to be great. tokyo joe and kyoto joe in LKF are always good too. :)
The best Japanese I've ever had in HKG would have to be Wasabisabi in Causeway Bay. Very fresh sashimi flown in daily from Japan. Very funky atmosphere too!