Have used Finnair from both HKG, BKK & CKG in the past. Even a short delay in departing can result in a missed connection in Helsinki. Happened to me once and was then re-routed via LHR.
A colleague used them back to MAN from BKK on Sunday, had a delayed departure, missed the connection and was then rerouted through LHR..... the Finnair promise of the fastest route to/from Asia then evaporates, and the BA flight via LHR, which leaves two hours after Finnair would certainly have quicker in that case.