there's really no need to form an argument for Kate. she's undoubtably a supermodel. same with Gisele.
i added KK to the list because she's the only one who's as close. She has had a huge amount of success in the high fashion world. she's been on every runway and in all the important campaigns. she has a ridiculous amount of covers, spanning from all of the Vogues, to the international W's and Bazaar's, Elle, etc etc.
and though she probably isn't a household name in the same sense as Gisele or Kate, she certainly has exposure. she is covered by magazines when she attends events. she was invited to the Oscars and was on numerous "best dressed" lists. plus, she's the only one of the models that's regularly on shows like Jay Leno, Conan O'Brien, even Oprah. she's been tagged "the next supermodel" by everyone from Anna Wintour to Marc Jacobs, etc.
Aaand, to top it all off --- it was reported in Arena's annual "Victoria's Secret Backstage" special issue that she's signed a new deal with VS for $25million, which will undoubtably put her in the same 'household name' status as any Victoria's Secret gal could be.
its about recognition. if you go to a news media photo site like Getty Images, you'll see over a thousand pictures of Karolina, compared to very little of someone like Daria or Natalia Vodianova. i'm not for a moment trying to suggest that Getty Images decides who's a supermodel and who isn't --- but it is a clear measure of public exposure.
she would be the Claudia Schiffer of the new pack. the blonde babe. not known for being a demanding diva. everyone who works with her has NOTHING but good things to say, a fantastic body that lends itself to the HC runways, and also to bikinis, etc etc.