There are lots of stealthy features to it. But it's effectiveness relies on the capability of its electronics, the Chinese have yet to compete with our AESA system and their air to air missiles are a bit primitive yet.
The key problem the Chinese have is a lack of AWACs type airborne, all weather, in flight, theater management systems.
The large internal bomb bays are indicative of more a fighter-bomber rather than interceptor. Todays use of such a platform would be for extended and persistent loitering over a battlefield to support ground operations.
BTW, Taiwan will have 4 AWACs type platforms in operation within 2 years, all weather, 24/7, the J-20 would be spotted. I strongly suspect the J-20 may be intended for sales to India, etc.
Line drawing -— interesting as this view shows entry into the cockpit in the conventional manner rather then the released photo which showed entry thru the front wheel well.
I don’t necessarily see room for that large of an internal weapons bay. If you look at the size of those exhaust nozzles they remind me of the mig 25 and 31. They will need to suck up alot of fuel Russian and chinese engines are not as fuel efficient as western fighters. Historically one of their main problems has been fuel management systems. AS far as stealth is concerned, those inlets look like almost a straight shot back to the engines and I wonder about the materials they have perfected for the surface coatings. As of now, it is quite a complex process to apply them even on western aircraft.
>>The key problem the Chinese have is a lack of AWACs type airborne, all weather, in flight, theater management systems.<<
Within a few years we will give them what they need.