Professional illustrator & graphic designer, been using fountain pens since about 2002, and I drain at least 3-4 bottles of Platinum Carbon Black per year, if not more. Unfortunately this means I rarely venture out into other inks because PCB is quite literally perfect.
Did you know that you can compare the inks listed here with your own (i.e. only show those that the other owns that you don't) if you create an account on the site and enter your inks? You can sign up here.