Not many I suspect although several have probaly come close if not equal in the past. In the case of the 0551 for me, what really compelled me to want it so bad was the design and apparent aptitude of course but also because it was a step away from ZT's standard fare. Something about an all manual, stonewashed blade steel, Ti framelock and no recurve makes this a VERY high end knife coming from an impeccible MFG like Zero Tolerance and that is something a knife enthusiast should not pass up, at least until you can hold it and feel it before selling if one must. I am pretty certain this knife will not go anywhere when I receive it.