When Apple released iOS 14.2 in November, it did not mention adding 1080p FaceTime calls on iPhone 8 and later devices. However, according to a MacRumors report that cited the Portuguese website MacMagazine, Apple has quietly updated the specs pages for devices like iPhone XR following the release of the iOS 14.2. According to the report, before the release of iOS 14.2, Apple did not list FaceTime HD (1080p) video calls on its iPhone XR pages but made the addition the week following the debit.
Apple now explicitly states that FaceTime HD (1080p) over Wi-Fi is available on all models, including iPhone 8, iPhone 8 Plus, iPhone X, iPhone XR, iPhone XS, iPhone XS Max, iPhone SE (2020), iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max.
The report adds that when it comes to using FaceTime HD, the only advantage of the iPhone 12 series is the resolution over Wi-Fi and 5G.