I have only one Faber-Castell fountain pen: the Loom. The nib is quite good, so I'm thinking about possibly buying more F-C pens down the road. Which brings me to my question: does F-C use the same kind of nib for all of its fountain pens, or does it use something different on its more expensive models (such as the Ambition or Ondoro)? And if it does use different nibs for different pens, have you noticed any differences in nib performance worth mentioning?