When I lived in Singapore we almost used AS miles for J awards HKG-SYD on one ocassion. Availability was roughly matching up with Asia Miles availability (and that seems to line up with QF and BA award engines). We wound up finding a dirt cheap SGN-KUL-SYD biz fare on MH and so never redeemed the AS miles, but it wasn't hard to find space into one of the cities in Australia on CX.