Those querying the comfort level must not have been in a modern King Air.
Have a look at -
King Air 350i
As you can see a 350 can seat up to 14 in hug density however with 8 pax seats it is pure luxury aka corporate jet.
Also those querying speed again fast machine.
The 350 is a beast. Wether or not it's the right aircraft for this role or wether this business model will work in Oz? Time will tell!
GA.