I don't know if I would call the Sebenza my "grail knife," but I have owned one for about 15 years now. I have used it so much that I had to send it in to get a new blade, because I sharpened away most of the old one. I think the Sebenza has a very clean, utilitarian appearance, which suits its purpose. As far as it being "bland" or "boring," I think it's important to remember that it came out over 20 years ago. At that time, it kind of turned the world of folders upside down, as nothing else like it existed. Much of what is around today was very much inspired by what Mr. Reeve designed and invented.
Another point I think is important, is the difference between "initial quality," and "long-term." There are many production knives that initially lock up very tight, are very smooth, and work perfectly. Use those same knives hard for a decade, and that will not be the case for all of them. When I sent my Sebenza off to get a new blade, I had been using it regularly for well over a decade. It locked up just as tight as new, and there was no blade play in any direction. To me, that is a very important difference. I have used quite a few folders over the years, and personally have never had a production folder do that. YMMV.