Yes sharper will penetrate bone better, not so much because its going to slice the bone or even crack the bone. In order to get to the bone you must first go through skin, muscle, cartilage, all kinds of stuff. Thats where the razor sharpness of your broadhead comes into play for penetration on bone. If it can slice through all that stuff with reletive ease it will carry more momentum to break that bone and keep going. There are differant kinds of penetration, the slicing kind which you need to go through muscle and organs and then the breaking/crushing kind which is needed to go through bone. To penetrate bone you need a sharp point but most importantlyyou needjust pure force to break it and keep on going.