Hello. I could say that no one speak portuguese as brazilian Professors say that would be the correct sound. I mean the exact sound of the vowels taught in schools. The main discrepancy may be the sound of vowels E and O. In many words we say the sound of O as if it was U. And in other words we say the sound of E as if it was I. But people from Portugal also make that "mistake". So, I am not sure it it is really a mistake. Teachers says that they are. In states of Southern Brazil people usually don't make this mistake, although they have some differente accent from other regions. Other discrepance is in words in sound of R inside words, as "bar", "barba", "borda", etc. and in words with RR as "carro", "terra", etc. Some regions pronounce this words with one sound and other regions with other sound, but with a little difference. Brazil has some large states. I am from Minas Gerais. We have about 4 accent only in Minas Gerais. All in all, what I can say is that our different accent don't block communications between us. There are just words which is more used in some regions to refer to somethings and in some regions people speak faster than other regions. I have been in many states from Brazil and I have always understood what people told me. The mainly accent used in TV Programs is the accents from Southeastern Brazil, specially from São Paulo/Rio.