Well, I think emotion is rather a complex thing. I would also say that there is a difference between basic emotions (like anger, pain, jealousy, gratitude, happiness, and so on), which usually stem from our relationships to other people; and, on the other hand, aesthetic feeling or artistic emotion, which is what you experience when you look at a beautiful work of art or appreciate the narrative construction and cinematography in a film, or a beautiful line of poetry, or even a philosophical idea or scientific theory.
The reason I make this distinction is that, although I can't speak for other INFJs, I am certainly much more comfortable with aesthetic emotion, and value it more highly. I also think that aesthetic emotion transcends and sublimates basic emotion, and thus justifies the suffering of life, because it is only out of the experience of suffering that aesthetic emotions are forged - which is to say, the base metals of basic emotion are alchemically transformed into the gold of aesthetic emotion.
My most elevated emotions come from a perception of the beauty and poignancy of life, and it's spiritual significance, and I regard the pursuit of these elevated emotions as the highest aim of existence, and the true path to truth and beauty.
I am also susceptible to becoming mired in the negativity of my own basic emotions at times, like a fly in a spider's web, and am very easily disturbed and upset my other people's negative emotions. In fact I feel quite incompetent when it comes to dealing with other people's emotions especially.
But perhaps this particular view of emotion has more to do with being an enneagram type 4 than with being an INFJ, I'm not sure.