Source: Fighter Jets World
According to Business Insider Article, A detailed report detailed how the F-35 had lost in dogfights with F-16s
F-35A Lightning II is prove to be an invaluable asset during Red Flag 17-01, the U.S. Air Force (USAF) premier air combat exercise held at Nellis Air Force Base(AFB), Nevada. The F-35A is a fifth-generation, multi-role stealth fighter designed to gather, fuse, and distribute more information than any other fighter in history
However even though during exercises the air-to-air combat is typically left up to the Raptor, Las Vegas Review-Journal reported that at Red Flag 17-01 the F-35As have been able to achieve an air-to-air kill ratio of 15 to 1 against aggressors jets.
Read more at: https://fighterjetsworld.com/2018/07/20/f-16-shot-down-f-35a-at-red-flag/?fbclid=IwAR0W9YusYXJrQmp3516yEI2TH37BgCsu5JrUiVLL33S-lrMqt1z5bi6-pJo