I'm not well versed when it comes to poetry, but I happen to have read a lot of Pessoa's work (mostly Álvaro de Campos) and it is very touching. I'd go as far to say that it's worth learning Portuguese (a very hard language) just so you can read Pessoa's texts without the translation.

My personal favorite is Tabacaria [0] (Tobacco Shop). That's a masterpiece.

[0] - https://www.azores-adventures.com/2015/10/tabacaria-by-ferna...