Concerning the Mission MPF check out:
http://www.bladeforums.com/ubb/Forum3/HTML/000225.html
http://www.bladeforums.com/ubb/Forum3/HTML/000208.html
I owned the MPF unit it met an unfortunate fate (stolen) and liked it. I have played with the Serbenza and did not like the handle as much as the MPF. The MPF in Ti is better suited for my needs.
The Serbenza did not have as secure as a grip as the MPF. The MPF has cut outs that prevent the hand from sliding forward as well as a grooved surface. Also, the top of the edge is serrated and radiuses for an even better grip. I can do hard thrusting with the MPF without fear of my hand slipping onto the blade. I found the Serbenza rather slippery and did not have a sufficient integral guard. Whats the point of having a strong lock if my hand is going to slide on the blade?
The Ti blade is easy to sharpen with the Spyderco sharpmaker. I gave a brand new Greg Lightfoot Sierra II along with some other blades (sharpened by me) and my freshly sharpened MPF to a friend to compare the sharpness. He could not tell a difference between them. Ti blade can be made really sharp. It cuts really well when it is sharp but sometimes does not stay that way for very long.
The Serbenzas handle is nicely radiused. There are no sharp edges. The edge is well polished. The MPF is not radiused very well and looks rather ugly beside a Serbenza. The corners are somewhat sharp and while this did not cause me any problems, the Serbenza would be a more comfortable knife to use. The MPF is kind of box like.
The Ti blade can also abuse such as leaving fruit juice or bits of raw meat on the blade for extended periods of time. I have run my MPF through the dishwasher. While it does not come out as slick openings a bit of grease will restore it.
Depending on what is done, edge retention can be pretty poor to acceptable with a Ti blade. It will loose its sharpness quickly with chopping (not something I would do with a folder but I have done it with the MPF). It also, looses it razor sharp edge quite quickly when cutting hard materials such as frozen food. For most slicing chores of relatively soft material such as fruits the MPF does pretty well. BG 42 will perform better with regards to edge retention.
The thumb studs on the MPF has damaged some of my clothing and they prevent a reliable quick draw. Once out the MPF opens easier than the Serbenza. The Serbenza will come out of my pocket faster and more reliably and no ripped clothing. Also, the thumbstuds on the MPF will jab into me if it gets bumped. Carrying inside the pants, clipped to the belt can be downright uncomfortable with the MPF.
Will