fantasy of Chinese forum, WS-10 is used mostly on J-11 for a simple reason a less reliable engine needs a mate if it fails on a single engine you need a more reliable engine because if it fails your aircraft drops, if China has better J-11 with Ws-10 why buy Su-35? in fantasy land for charity, but in real land J-11 has not better performance than Su-35,otherwise you will never buy Su-35 specially now China has TVC nozzles, and remember ARJ-21 and 919 use western engines none fly on Chinese engines but there are Tu-214 flying with Ps-90s.
J-10s fly on al-31 for a reason, a more reliable engine..
Y-20 has engines that burn fuel in higher amounts, the payload is how large in the cargo compartment, but how much fuel you burn on your engines means your performance is lower, Il-476 has new wings and better engines, it will burn less fuel regardless your Alice in wonderland story