If I can get the time, I'll grab some macro shots of both. From what I have seen, the jaw serration is definetely in the same league with no notable differences.
The pairs that I've seen in person, the Kleins had a sloppily cut serration with the two different directions varying in depth and sharpness... the Knipex serrations are razor sharp, symmetrical, and perfectly formed.
On top of that, Knipex actually bothers to applpy a micro-bevel to the outside edges of the jaw serrations to smooth over any snagging sharp edges. Knipex is the only plier maker I've seen that pays that much attention to detail.
They don't just do it on the linesmans either, the needlenose and other models have the same feature. Gives a very nice finished feel to the jaws, and makes the pliers glide up and down wire without snagging, but grab hard when you ask them to. Very nice.
This has only been over a few sets, not to say that is the case with all.
