I think that the typical Swiss Army Knife does'nt compare directly to the typical multi-tool for several reasons.
SAKs seem much more handy for quick use. With the exception of the largest SAKs, it's very easy to quickly select the tool that you need with a SAK.
I seem to have to search for a specific tool when using a multi-tool. And many multi-tools require opening the handles to access the tools.
I also think that most folks are more likely to break a multi-tool that a SAK.
This is because the multi-tool SEEMS extremely strong and capable of more than it actually is able to accomplish.
But you instinctively know that a SAK is not an extreme use tool, so you're less likely to push it beyond its limits.
I've broken two multi-tools and I was truely surprised when they broke. I did'nt think I was stressing them that much.
I've also broken one SAK and I knew that I was pushing it to its limits and so I was'nt really surprised when it snapped.
Here are some multi-tools that I either have owned or still own:
Leatherman:
PST
Crunch
Super Tool
Wave
SOG Power Pliers
Gerber:
Legend
Pro-Scout
Victorinox Swiss Tool
The one that I actually use and prefer is the Gerber Pro-Scout.
I like it much better than the Leathermans for a few reasons:
The pliers are quicker to deploy with one hand.
All of the tools lock, and the lock is the easiest to manipulate bar none!
It's just the right weight and size.
The pliers NEVER stick (this has been a problem with my PST. The pliers stuck closed on a cable, and when I tried to open them the handles folded close. I had to use my Gerber to pry them open).
The handles never cut into my hands when applying alot of pressure.
The saw-adaptor allows for me to use any standard jig-saw blade so I can choose metal saw or woodsaw and I can replace them when they dull (have you ever tried to sharpen the teeth of a woodsaw on a multi-tool? Not much fun, huh).
And, contrary to what Gryffin has experienced, I think the Fiskars scissors work just fine (although they do have a small bite).
I don't like every Gerber multi-tool (the Legend is just too big and bulky IMHO), but the Pro-Scout is a great (although not perfect) multi-tool.
Allen.