I'm glad you brought this up. If you look at knives in the different price ranges you will notice that the materials used in the knives about top out at 100-200. titanium, carbon fiber, g10 etc. for handles and anything from 154 cm, s30v, s90v, etc. steels can all be found in that price range. You will also find these knives to be of very high quality and f&f, no blade play, solid lock up, etc. The lower the price the less expensive materials used and possibly less of a quality f&f. That's not to say it's any less of a cutter but the increase in price is because of something substantial, the materials and craftsmanship.
And this is where you're extra money for the Sebenza is going.
When you look at a more expensive knife, in this case the sebenza you see a much higher price then the 100-200 range but yet the materials are basically the same. The blade play, ff, lockup will also be very good. That is where I don't understand. The materials aren't any better. The blade play, ff, lockup, tolerances are already so good on the 1-200 knives does the .0005 really mean anything?
This is where you answer your own question by actually owning or at least handling and using one.
Will it even be noticeable?
Obviously it is since they've been selling for as long as they have at the price points they do.
If it is does that justify a $200 price increase?
According to two major players in the knife game Thomas W. from Kershaw and Sal from Sypderco, yes it does.
I'm not so sure that it is and I can't imagine something being any tighter then a top of the line BM or Spyderco.
And that is becasue you still have never owned, handled, or used one.