Off the top of my head:
John Crowley absolutely qualifies.
Little, Big alone would put him up there.
Kelly Link is arguably one of the best short story writers ever in the English language, let alone among living authors.
Eimear McBride is an astonishing novelist who could well be up there if she keeps writing to the standard of her first two books.
Hillary Mantel has won the Booker prize twice - only the fourth writer to ever do so - and is a novelist of incredible variety.
Ada Palmer's
Terra Ignota quartet isn't finished yet, so it's hard to fully judge her work, but it's got the potential to be among the greatest SFF series ever written.
Sofia Samatar has flown under almost everyone's radar, but is quietly one of the most distinct voices writing in English today. She's got the potential to be up there as well.
Catherynne Valente is one of the greatest prose stylists I've ever encountered, and unbelievably prolific to boot.
OP, Gene Wolfe is one of the all time great scifi fantasy authors and one of the last of a dying breed. His prose is amazing and he weaves terrific stories.
Seconding this too. Wolfe's definitely up there.