But that's only a 5 hour time-zone change. Worst case you get tired a little earlier in the evening than you're used to and you wake up a little earlier.

With the 12 hour difference between NY and HKG (the worst possible, since it's exact opposite), it's not just minor adjustments. Even with 5-6 hours of sleep on the flight to HKG, and with staying up until my "normal" bedtime in HKG, my body still wants to wake up at 3-4 am for some reason. Sometimes an ambien will keep me asleep until 7 or 8am. But then when 4pm rolls around, I am beyond exhausted. The only way I have found to mitigate this for myself has been the 889 overnight flight to HKG. But it's still not perfect, so I usually have to make sure to plan my schedule according to the anticipated impact of the jetlag. That means business breakfasts but no business dinners. YMMV.