For the purist, the Brazilian Blu-ray release of Mamma Mia is the ultimate "extra quality." Discs are not subject to streaming compression. You get a DTS-HD Master Audio track and a 1080p transfer that surpasses most streams. Look for the "Edição Especial" with the Portuguese dubbing track explicitly listed on the back cover.
Before diving into the technicalities of "extra quality," it is crucial to understand why the Brazilian Portuguese dubbing of Mamma Mia (2008) and its sequel Mamma Mia! Here We Go Again (2018) is so beloved. Dubbing is an art form, and Brazil has a world-renowned dubbing industry. mamma mia dublado extra quality