Turkish's business class is superb, directly comparable to ANA or Singapore. I traveled with them round trip a few months ago, loved it. I even spent four days in Istanbul, had no issues and never felt unsafe. If you flew them to Asia it would be going "the long way around" and would add a lot of travel time, however you might not mind with how comfortable the seats are and how good the food/service is. Their lounge in Istanbul is considered to be one of if not the very best business class lounge in the world. Highly recommend taking advantage of the wide open availability if you can't get a direct flight.