While not Portugese but still from Iberia, I was very fond of Negra films from Spain. When I was still living in London a colleague used especially imported Negra 35mm films and the results were excellent. For some time Jessop in England sold rebadged Negra as its own "Pan 100". I finished the last of the small batch I brought from England years ago and it was very satisfactory indeed. I think a little while ago the formula for this film was changed, and I really have no idea if Negra is still making it.