Chris is always changing and innovating. If you remember way back when, the H Sebenza, P Sebenza, Original Sebenza and Regular Sebenza all had the same blade shape, though with different finishes over those years. When the 21 came out, it was a different shape in a new direction. Now we have Insingo and Tanto as regular production, that was not the case back then, though there were regulars N.I.C.A. that had tanto blades.
I too love the regular blade shape and much prefer it over the 21. But just as the OPK came to an end, so did the older blade shape most of us loved. I am just glad CRK is still cranking out the knives we all know and love. With the 25, to me at least, its almost a hybrid of the regular and 21 blade shapes, all combined into one.
In the end though, its the Large Regular Sebenza that does it for me.