Of course the competition is introducing new aircraft as well:
- Bombardier 8000 will have higher top speed and whee! the fuel it guzzles at 0.94M can be ‘sustainable’
- Falcon 6X will have wider cabin (development took a while because Safran engines did not work out for 5X which 6X design comes from), Falcon 10X comes later
More range is still a goal, the B8000 can only get to Perth from London, most people will want to go to eastern Australia.
Engines on Gulfstreams are not well specified, many are the R-R Pearl BR 700 series, usually with a number like BR715, but ‘Pearl 700’ powers the G700.