Well since you want to play, lets take a look at some number, shall we?
Certified Ceiling:
Javelin: 45,000 ft
G-V/G-550: 51,000 ft
(Not sure we would even be able to see the little Javelin a full nautical mile below us... So much for climbing above us!)
Cruise Speed:
Javelin: Mach 0.90 (advertise but yet to be achieved)
G-550: Mach 0.87 (demonstrated daily)
Range:
Javelin: 1,220 NM (at Mach 0.80)
G-550: 5,000 NM (at Mach 0.87), 6,000 NM (at Mach 0.85), 6,750 NM (at Mach 0.80 w/ 8 passengers & 4 crew)
Non-Stop Endurance:
Javelin: 3.5 hours
G-550: 14.7 hours
Cabin Pressure Differential:
Javelin: 8.3 psid (about an 8,000 ft cabin at 45,000 ft)
G-550: 10.17 psid (6,000 ft cabin at 51,000 ft)
Certification:
Javelin: Experiental
G-V: FAR 25 since 1997
You are comparing apples to oranges...