The maker of the J-20 would likely design the aircraft based on performance requirement alone, just like they do for other earlier gen aircrafts. To them, how it'll turn out aesthetically is almost irrelevant. I suspect American aircraft designers work towards making an aircraft that meets both the performance and aesthetics department.
any designer works for functionality, not aesthetics, we humans give the beauty based upon many factors.
The J-20 is beautiful in its own way, i do not think it is ugly, but definitively i like more J-10B, i like more ventral intakes and twin seaters.
T-50 is not ugly but it does not make me feel is very beautiful.
The F-22 is rather conventional but i like its radome is more ogive like, J-20`s is more triangular or conic.
In looks i like more the F-22 than T-50, F-35 or J-20 of these 5th generation fighters.
From 4th generation my favorites are F-16, MiG-29 and F-14, but in reality i like most 4th generations F-15, F-18, Rafale, Lavi and Su-27 i feel they are really beautiful and Gripen, Eurofighter, AMX,LCA, Harrier, Ching Kuo, JH-7A or J-10 are okay but not my favorites, Mirage 2000 and MiG-31 well are okay but they are not my favorite too.
Third generation well MiG-23, AJ-37, A-4, Su-24, F-111 are my favorites.
But if someone asks me what jets i really like i would say MiG-29, Su-24, F-14 and F-16