I am doing some research on this, and there are only a handful examples that I have found. Obviously the best way to have a more comprehensive overview is to have the same person with the same ink to do a writing comparison between the available nibs, but this is a bit of a stretch-out scenario. So, could you please upload some writing examples with your nib sizes, I am more interested in the F (Fine) and FM (Fine Medium) region. Intend to use it, as an note taking instrument. Although the F is not being manufactured any more from Pilot/Namiki, the FM has taken its place. Any help would be very much appreciated, I have experience with Pilot nibs in the F region from 823 and 845, but these are No. 15 size nibs and although they could be taken as a rule of thumb, wanted some re-assurance from the actual users. Thank you!