These videos by Brian Goulet of the Goulet Pen Company are older but still relevant, so I am putting them here as reference for anyone who is looking for information comparing the paper in the Quo Vadis Habana notebook vs the Leuchtturm 1917 and the Moleskine notebooks.
Here you can see Brian’s video where he answers a reader’s question about which he prefers for use with fountain pens: the Habana notebook or the Leuchtturm 1917. (Spoiler alert: it’s the Habana!)
In these videos, Brian does a detailed comparison between the Moleskine notebook and the Habana. In Part 1 he compares the features, and in Part 2 he compares the papers and how they perform with fountain pens.
In fairness, the Habana paper is 85 gsm so naturally it will perform better with fountain pens than Leuchtturm 1917 (with 80 gsm paper) and Moleskine (70 gsm). Aside from the weights of the papers, the Leuchtturm and Moleskine papers are both more absorbent than the Habana paper, which is specifically designed to resist feathering and bleed-through with most fountain pen inks.