Isn’t the main thing that makes a chisel better or worse the material quality, such that regardless of whether it is hand made or factory made, the chisel made of superior material is better?
Selection of metal, lamination, presence of a ura (裏), handle material, the ability to make a new handle and attach it to the original metal. A metal chosen for an extreme sharpness may be terribly difficult to sharpen, a metal easy to sharpen may not hold an edge for long.