Hello all, I just recently purchased a Pilot CH 91 in soft fine and while I adore this pen, it wrote perfectly out of the box, I find myself wanting to experiment with other high end Pilot pens. The only problem is that I have a fairly narrow comfort zone when it comes to nibs. I like fine, wet daily writers and my ideal nib size is either the SF or maybe the SFM or similar. Is there any variation between the nib sizes that might justify the jump up in price or should I stick to the Pilot CH 91? The idea of a larger nib size appeals to me so if I buy a CH 912 should I go for a different nib or is there a difference between the #5 Soft Fine and the #10 Soft Fine?