Ok. I’m going to start by saying that this could be a great number of things other than the fault of the knife. It could be inner bias because of the condition I received it in. It could be the fact that it does not have a very good edge yet. It could be the fact that my technique might be wrong. In a week when all of this is corrected I could completely change my tune.
I like the BK4 better. The BK21 didn’t chop all that well in thick stuff (transferred too much shock to the handle, didn’t cut deep enough for it’s forward weight.) It didn’t cut through thin stuff like the BK4 does. Going after vines was like hitting them with a stick. The BK4 is impressive to chop with, even when dulled. This is not. When I ordered it my desire was for a BK4 with longer reach. That’s not what this is so far.
Again, I could be completely off and when I do work on the edge and get better technique everything could change.