Latterly I've become a big fan of Pilot Pens. I had a couple of vintage models, but a few months ago bought a Resin version of the Falcon with SF nib. I have been mightily impressed with this pen, although the nib isn't as flexible as I had hoped. However, compared with the flex nib on my Noodlers, it was in a different league; so it should be of course with such a price differential.
So...I then bought a Pilot Custom 742 with the Falcon nib...this really does have a fabulous flexible nib, capable of great line variation.