What weight? does it matter?
Just picking 60K lbs cruise weight here is some ballpark #s.
One engine inop - limited by 1.4% enroute climb gradient - 31,000 ft
Two engine inop - limited by .3% enroute climb gradient - 16,000ft
We compared the 7X and the G550 also, and in reality they are simply very different airplanes. The operating numbers and the budget on the 7X was the deciding factor on this particular purchase.
Good Luck!