Not all Asian carriers have the top business class products, but all of the truly best business class products are offered by Asian or Middle Eastern carriers. Take Singapore Airlines. With a four-across configuration like in first class, Singapore Airlines seats are incredible wide and they are also relatively private.
Increasingly US airlines are eliminating first class, with American slated to be the last carrier offering it and then only on their small fleet of Boeing 777-300ER aircraft. And US airlines don’t offer service or food that’s as good in first class as some of the better carriers offer in business. But I’ll still always take first class over business class.