Believe me they will be a lot harder than koni yellows on standart springs. And it's not only about comfort, if you plan to drive the car on uneven roads the handling with the rallye/asflat coilovers will be worse than koni/std springs
I'm saying this because I have a lot of experience with both konis and k-sport (i suppose they are the same as d2, will not be surprised if they are made in the same factory) coilovers on my other car