Price it at 1.00, besides with DC 10 30 they have a lot of capacity and would roughly fill 90-95% max. I would suggest not to operate the route as there are 2 more airlines and would lead to an unhealthy price war
Use 747F if the base city and destination city has business ratings of 400+ ONLY. (HK-Moscow, HK-Cairo), HK-London is also possible with engine upgrade and would most likely be a monopoly. Wait for 777F or Airbus series which offer low capacity and higher range.