Quills and dip pens write wonderful sharp thick and thin strokes and are easy to use on one’s own writing desk. But no one sane — however passionate about handwriting — would, for example, walk into a meeting, dip pen and ink in hand. Fountain pens that have italic, stub or calligraphy nibs are the best portable options.
So keeping in mind that fountain pens will never provide the same results in terms of sharpness, these are some of the available options.
Lamy produces three different kinds of calligraphy nibs: 1.1, 1.5 and 1.9 mm broad. They can be ordered separately and can be easily fitted on most of their models.
Online is a relatively new brand. (I don’t think they manufacture their products) and lately launched a calligraphy pen that comes with 3 different sections and nibs 0.8, 1.5 and 1.8 mm broad. These are the sharpest nibs that I have come across on fountain pens.
Pilot’s Pluminix pen is incredibly cheap, around 6 USD. The Pluminix B model has a 1 mm broad italic nib.
Stipula is an Italian luxury pen producer. Many of their models have an optional italic nib. This is the Stipula Vedo pen with a 1.1 mm italic nib. It is quite sharp and velvety smooth. It is one of my favourite pens.
Sailor produces pens with an huge variety of nibs. They make some really unusual nibs that provide line variation such as the Naginata Togi and Fude. This is their ‘music’ nib. It is not sharp and writes very thick and wet strokes. It’s fun to use.