Based on just a few exchanges in Dutch (I'm a native speaker), I'd say it's pretty good. The conversation sounds pretty natural (albeit shallow). Maybe the quality differs per language?
Of course there are differences, but both Dutch and English are West Germanic languages (descended from proto-Germanic) whereas Portuguese is a Romance language (descended from Latin).
Here is a handy tree showing how various languages are related to each other:
https://d1sjtleuqoc1be.cloudfront.net/wp-content/uploads/201...
It's word ordering and idioms where AIs stand or fall. Things that show very little correlation in the evolution of language.
It describes genetic descent.