While "1080p" is the standard target for high-definition anime, the actual visual quality of FMAB varies significantly depending on how you watch it.
Starting Full Metal Alchemist: Brotherhood, Sub or Dub? : r/anime Fullmetal Alchemist Brotherhood English Dub 1080p
Unlike many series where the "Sub vs. Dub" debate is fierce, the FMAB English dub is nearly universally praised. There are several reasons why it stands out: While "1080p" is the standard target for high-definition
Interestingly, Brotherhood was originally animated at a 540p master resolution. All 1080p versions are technically upscaled, but higher-quality releases manage this much better than others. Fullmetal Alchemist Brotherhood English Dub 1080p