3V would have been my preference too but A2 is what they went with. Is A2 an upgrade, downgrade, or equivalent to O-1 Tool Steel?
Properly heat treated, I think A2 should be an upgrade. I've used A2 from Busse Combat on one of their old models, and was suitably impressed!!
Should take a lovely grey patina, while being a little less rust aggressive. Should also hold an edge a bit longer, and maybe be slightly tougher.
If I were buying a custom, I'd probably take A2 over O1.
A2, will hold an edge a little longer, but will also take a little more effort to sharpen. *(this is info from a manufacturer of both o1 wood planes, and A2 planes from the same maker).
A2 should be significantly more red rust resistant due to the differences in composition.
Alloy________________O-1_________A2
Carbon______________0.9__________1
Manganese__________1.2__________0.6
Chromium___________0.5__________5.25
Tungsten____________0.5___________--
Vanadium___________0.2__________0.25
Molybdenum_________--___________1.1
I am one that uses knives in 1095 steel in most of my pocket (similar rust characteristics with 01). So I'm not too scared of rust. 1095, and other 10XX steels, 52100, and others get rotated through my users.
I honestly don't think I have any A2 right now, but based on prior use, I'd probably not hesitate to get another knife out it.
If asked I'd choose 01 over A2 but that is a personal choice.