According to the US Defense News website, high-resolution photographs taken in Zhuhai show that the early mass-produced aircraft of the Chinese Air Force during the J-20 period showed a "rapid improvement in quality".
The report points out that these aircraft "have improved surface quality and production consistency compared with previous prototypes, indicating that China continues to make progress in narrowing the gap with the U.S. stealth design".
However, China still has a long way to go to reach the low signal level of the fifth generation fighters such as F-22 and F-35. This is due to the persistence of external accessories and the improper installation of J-20 engine nozzles and photoelectric targeting systems.
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