I donno is he especially good /bad at pens? Usually Mahrez who takes them for them and he is pretty good at them I recall? Maybe KDM is not far off?
I would say penalties are a special skill because of the additional psychological pressure so some players who are good normally may not be able to handle the pressure. Kane obvuiously can handle that. The thing is Kane is great at shooting from distance too. Just not if it's a free kick. It's always perplexed me. All you have to be able to do to do okay at free kicks is be able to hit the ball where you want it accurately. He should have no problem with that. Obviously to be really good at them you need more, you need to also be able to hit it hard (usually), get it up and over the wall (usually), be able to curve the flight of the ball. But Kane is not even able to do the first of those things to be an okay kick taker even though he can hit the ball right where he wants it both from open play shots and passes, including long passes (with both feet) and from the spot. Oh, and corners too, at least for England, he was okay at that.