HMM...that will require me to apply my thinking cap. I might PM you instead later but as far as great prose stylists go a few of my favourites would include Jack Vance's Dying Earth, Patricia Mckillip's fiction esp RiddleMaster of Hed, Miller's Canticle for Liebowitz, John Crowley's Little Big, Dunsany's King of Elfland's Daughter, Hope Mirlees' Lud in the Mist, Gene Wolfe's Book of the New Sun and Ted Chaing's Story of my Life collection, Avram Davidson's short fiction, Le Guin's Left hand of Darkness or for a more archaic but marvellous style Edison's Worm Oubourous. I'm also an admirer of China Mieville, Neil Gaiman and Neal Stephenson but they don't quite fall into the same class as those already mentioned.
Then moving outside the more obvious Genre fiction but still focusing on writers of the fantastic as this is more my particular field these days I would suggest as a
sampling Italo Calvino's Invisible cities and If on a Winter's Night A Traveller, Angela Carter's Bloody Chamber & The Infernal Device Machines of Doctor Hoffman, Bruno Schulz's Street of Crocodiles, Jorge Lois Borges' collection Labyrinths and Adolfo Bio Casare's Invention of Morel.
Moving more into General literature which I guess is where Knigslover falls into, again as a
sampling the fiction of Evelyn Waugh, Virginia Wolfe, Vladimir Nabokov, Somerset Maugham esp. his short fiction, Stefan Zweig, Yeshar Kemahl, Yusinara Kawabata, Joseph Roth esp. Radetzky March and W.G. Sebald, Robert Walser...OH and the Poetry of Pablo Neruda...more 20th Century than earlier but if I go down that path I'll be here for several more hours building on this post and well and truly derailing this thread.
I realise this is a very broad response (I got a little carried away) but I wanted to encapsulate some of the authors I consider very highly, some of whom you may wish to check out/interest you that you're yet to try?
This is not to say Knigslover is in a class of her own but I'm not sure who I would compare her to directly to in or out of Genre? Following is a link that provides some suggestions...not sure how like they are but certainly Mathieson, Erdrich and Atwood are worth a look in any case and I'm a fan of McCarthy's Blood Meridian in particular but there are several about here who are not.
http://www.multcolib.org/books/lists/barbarak.html
Hope this helps a little Hare.....
Cheers.