I have a few (around 7 Safari's) with all nib sizes, including calligraphy (flat) ones. U have other fpens as well. Ballpoints dont get as smooth as fpens, not the either way around. However, the writing experience is dependant not only on nib size, but also the feeder/fins, the type of ink, the angle of your hold, the paper's tendency to bleed. The B nib works great on rhodia/oxford but tends to bleed on less glossy paper, whereas I prefer the F/EF for Moleskine and similar.
I have a few (around 7 Safari's) with all nib sizes, including calligraphy (flat) ones. U have other fpens as well. Ballpoints dont get as smooth as fpens, not the either way around. However, the writing experience is dependant not only on nib size, but also the feeder/fins, the type of ink, the angle of your hold, the paper's tendency to bleed. The B nib works great on rhodia/oxford but tends to bleed on less glossy paper, whereas I prefer the F/EF for Moleskine and similar.