It may be a contender, but a game changer? Not likely. It's a 20 year old design fresh out of the gate. One thing Cessna has right is bringing an airplane to market. Conception to production is measured in 2-3 year range. I like the phenom 300 but they utterly dropped the ball in the last 10% of certification. Let Embraer design it, Cessna certify it and you would have the game changer.
The Honda jet will be lucky to surpass the phenom 100 in quality/reliability/make book numbers.
Honda is not Embraer, Cessna, Raytheon, or any other established aerospace company.
Remember, the E-collapse 500 was a game changer too. Cessna and Embraer bitch slapped them out of existence, and this after they committed engineering/production suicide.