JSF (Joint Strike Fighter) is inferior to J-20 Mighty Dragon
1. JSF does not have supercruise capability.
2. JSF is not an all-aspect stealth fighter. It has less-stealthy LOAN (low observable asymmetric nozzle) nozzles. The flat nozzles on the F-22 are the best design for radar and infrared stealth.
The J-20 is likely to install flat nozzles when the powerful WS-15 engine is ready, because it is the only feature where it is clearly inferior to the F-22.
3. JSF has bumps along its entire bottom. There is also a large protrusion above the left airduct for the cannon on the F-35A, which makes it less stealthy.
4. JSF uses cheaper materials, which compromise stealth.
5. The combat radius is only half of the J-20.
6. JSF lacks internal side weapon bays.
7. The JSF is significantly smaller in physical size and can only carry a much smaller radar with less T/R (transmit/receive) modules. Since it has only one engine, the available power to the radar is also significantly less.
The JSF radar is clearly inferior to the F-22 and a J-20 equipped with AESA radar.
8. The J-20 will be able to look down and shoot missiles (with better kinematics or more kinetic energy) at the lower flying F-35. The service ceiling of the J-20 is 65,617 ft. It is only 60,000 ft. for the F-35.
In conclusion, the JSF is no match for the J-20. The battle plan is for the F-22 to engage the J-20. However, there are only 187 F-22s. The military balance may shift if China produces 300 or more J-20s in the future (circa 2018).
Sensor fusion doesn't mean much when the J-20 has a larger radar and greater detection range than the F-35. Furthermore, the J-20 has a cleaner design and is stealthier than the F-35. Sending a F-35 against the J-20 is unwise.
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Latest J-20 "2002" Mighty Dragon photographs
Notice the gold transparent RAM on the J-20 cockpit canopy. Only China and the U.S. have this advanced material science technology.
The prominent DSI (diverterless supersonic inlet) strake was probably extensively modeled with Chinese supercomputers.
When the WS-15 engine is ready in a few years, China can replace the J-20 LOAN nozzles with flat nozzles. The J-20 will be good to go against the F-22.
[Note: Thank you to Greyboy2 for the pictures.]