HI 30" AK: 5lb 4.4oz...............(84.4oz)
HI 18" AK: 1lb 14.4oz.............(30.4oz)
Busse Killa Zilla: 2lb 5.6oz.......(37.6oz)
Busse NMFBM: 1lb 12.6oz.......(28.6oz)
Busse Tank Buster: 1lb 1oz......(17oz)
Busse Boss Street: 8.8oz........(8.8oz)
as a short description of my in hand thoughts on the kz, it's a heck of a lot better than the nmfbm. more than anything I think it's the handle. The only fusion handled blade that I've held that felt as solid and whole as the kz is the cghogfsh. every other fusion handled blade either felt like a piece of bar stock or just not quite right.
With the fusion handles the pinky area is pretty small and the palm/finger swell is pretty round. the result is that the knife rotates in your hand as you chop.
With the KZ the index and finger area's were thickened and the indent between the center of the palm swell and the back of the pommel was removed, so the palm swell forms a straight line down to the lanyard hole. The result is a much more secure locked in grip, one that doesn't rotate inside of the hand like the fusions do. with the mags and the consistent top to bottom grip pattern, you get more of an axe handle feeling, where everything is uniform and tight.
Where the fusion handles are made for more of a whipping action, the kz is extremely well suited and dedicated for chopping.
The kz feels more like a lightish 20" ang khola then an 18" for those who are used to hi's ak's.