if C17 price tag is 680 millions per piece that machine WORTH IT!
Do you have any idea about American Made weapons ? India is New in this.. Pakistan using American Weapons since last 40 yearrs. There is NO COMPARSION btw Russian/Chinese VS American Weapons. China still failed to make any good engine and comparsion with American made C17 is like.... you compare 1000cc cheap car with Lambhorghini Aventador.
If China want to make this baby Y20 VS C17, China should spend $$$ + R&D make their own top class engine, jamming system, Control etc and these things required Time. Right now this is VERY VERY Good initiative by China to make something like WOW.... but for WOW you need to spend time/money and make your own engine. Might be in future this machine maybe may be beat or surplus or near C17.