To each their own. Everyone has different taste. I personally find Karina massively overrated. That isn't to say she isn't stupid hot, obviously she is. But she wouldn't even be top 5-10 in terms of looks for me. It gets a bit old seeing her at the top of kpopfap with thousands of upvotes and it's just her walking through the airport in a t-shirt. Great tits though.
It would be useless because she doesn't have the same diet as Sohee so she can't grow her ass more. Chaewon actually lost weight this year, very noticeable on her face and definitely on her ass/thighs.