Depends. I’ve gotten business for as cheap as $2k one way transpacific. Got lucky once and scored ~$900 between Beijing and Bali round trip. Google flights helps a lot if you have flexibility.
Flights in Asia are generally far cheaper and, in my experience, more comfortable. Business class on longer flights in Asia is much cheaper than the same distance in other places I visit. But usually economy has less seats / more space too, at least in the airlines I fly with.