According to this article, the Kona EV has a Cd of 0.29
https://arstechnica.com/cars/2018/10/the-new-2019-hyundai-kona-ev-is-a-clever-little-electric-crossover/
It's hard to find the frontal area for the Leaf and Kona, but I'm guessing the Kona has a smaller frontal area so the resulting drag...