China’s new J-20, nicknamed ‘Weilong,’ is one of the world’s most advanced fighter jets. But how does it compare to the American F-22 Raptor? Let’s find out.

In July, the People's Liberation (PLA) Army Air Force, China's aerial warfare service branch, released a video of J-20 nighttime training exercises. The warplane was developed by Chengdu Aerospace and first entered service in 2017. The US F-22 Raptor, which first entered service in 2005, was developed by Lockheed Martin to be used by the US Air Force, the South China Morning Post (SCMP) reported.
IDN Edit: Comparing the incomparable is downright silly. True stealth relies on the shape of the aircraft, its exhaust, material composition, cockpit shielding, and even flight characteristics. A lot more goes into a stealth fighter design than low observability, the construction processes to all the little details in terms of design tolerances and things like disruptions in surface smoothness from hatches and panels. Having a low observation platform alone does not entail the J-20 a credible fighter, at best, the J-20 is probably stealthy only from the front. Chinese military tech lags decades behind the U.S., even the Europeans are huffing-and-puffing to catch up with American technological superiority. In short, China's new fighter jet can't touch the U.S. plane it rips off.
The two planes, both made of advance-alloy materials and weighing some 19,000 kg, are sized similarly. The J-20 is 20.3 meters long and has a 12.9 meter wingspan while the F-22 is 19 meters long and has a 13.6 meter wingspan. However, the J-20's loaded weight is heavier, at around 32,000 kg compared to the F-22's 29,000 kg. The US plane can take off with a maximum weight of 38,000 kg, slightly more more the J-20.

Both planes have a maximum speed faster than the speed of sound at 2,470 kilometres per hour. The F-22 has a shorter combat radius of 800 kilometres, while the J-20 has a combat radius of some 1,100 kilometres thanks to a large internal fuel tank, the SCMP reported.

The F-22 features afterburning turbofan G199-PW-100 engines that include vectoring nozzles which allow the US warplane to carry out maneuvers at speeds above the speed of sound. China did not develop advanced turbofan engines due to production delays, but the J-20 is expected to include a new WS-15 engine next year, will which greatly improve the plane's maneuverability and stealth capacity.

While the J-20's frontal and side stealth capacities are said to be superb, it is believed to be more susceptible to radar from the rear — in comparison to the F-22.

The fighters carry their weapons in internal bats. The J-20 can hold up to six air-to-air missiles and hold longer range missiles or an LS-6 precision-guided bomb. The F-22 can carry eight short or medium-range air-to-air or air-to-ground missiles in addition to an M61 Vulcan gun and four under-wing drop tank points. 

Both fighters have highly-integrated avionics and sensor equipment that include low-observative, active electronically-scanned array (AESA) technology that can detect multiple targets under all weather conditions.

There is, however, a significant difference in cost, as each F-22 costs about $399 million, and each J-20 is reported to cost between $100-110 million.

Military pundits assert that while the two fighters are comparable in design and performance, the F-22 is slightly superior due to its advanced engine, although, with the addition of the new Chinese WS-15 turbofan, power parity may not be far off.