I think "No question asked warranty" is overrated. Are you asking what companies will let you return a knife for replacement that you have purposely cut it half with a blowtorch? If the answer is yes, then I would ask why? Otherwise there are plenty of manufacturers that will replace a fixed blade knife if it fails. Many already been mentioned: Buck, Kershaw, BRKT, Strider, Busse kin, and I'm sure many others.
When it comes to folders I would say that ESEE warranty is not the best. I honestly have expected a bit more from them (just in the warranty statement). I think they screwed themselves on that one. I'd rather take Strider, Kershaw or Buck warranty when it comes to folders.