I do believe this depends entirely upon the knife itself. I've had older CASE knives [ 50 years old...] you could put a razor sharp edge on, they'd wipe the hair off your arm, but as soon as you cleaned your fingernails with it and opened the mornings mail you could have put it on your saddle, rode to Cheyenne, and not scratched your fanny. I have also seen CASE CV knives in which one blade was superb, one blade was as worthless as mammaries on a stud horse, and the third blade was somewhere in between. IT does seem to me the modern made CASE CV knives have better heat treating than in the old days as none I've bought in the past couple of decades has been anything but quite excellent. And then again, ALL of this might be, maybe is, nothing more than luck of the draw !!!!
And so it goes...