Check Professional Pilot magazine - I think it has an annual pay survey that includes the Global Express.
Other factors influencing pay:
1. Actual time and experience
2. Local market conditions (i.e., a flood of pilots)
3. Previous pay package
Just curious - where are you located - in Europe, USA, Asia? What previous experience (aircraft types) do you have? How do you get a cherry job like that???????????????
Best of luck