Bower is also sold as Rokinon (US) or Samyang (EU). We call them the 'Samyang lottery' due to their poor quality control. Many lenses are decentred, but the 'good' ones are well suitable! Therefore I only use their premium line, called Rokinon SP and Samyang XP which has a better quality control. So I can only compare the Brightin 14/2.8 against the Samyang XP 14/2.4 and I use them only for astro photography (mostly polar light): The Samyang is more heavy, more expensive, has slightly less coma and less vignette (and is slightly faster). The Pergear/7Artisan/Brightin 14/2.8 is lighter, cheaper (!), has slightly more coma (but I would still call it low), and a strong vignette. I tested several Pergear and 7Artisan 14/2.8 lenses and they have a similar quality control as the Samyang XP serie. That means most lenses are well centered. The Brightin Star/7Artisan/Pergear 14/2.8 seems to have problems with flares from strong light sources.