A bit of edge, but need to mention Helmut Newton. Love him or hate him, there is no mistaking the uniqueness of his style. In the age of complicated studio fashion and portrait shoots, he preferred one camera and natural light.
No, I am saying that even if he used natural light, the result of whatever it is that he does is anything but natural in appearance. That's all. N.b. I did not express any like/dislike of his work, I simply do not [personally!] find it in keeping with the general objectives of available light photography.
Not all of Sieff's work has the "halo"...much of it involves, in fact, beautiful natural light. Actually, much of his studio work that is "lit" has the halo burning he was so fond of for a while...
Either way, the large Sieff book by Taschen is probably the best photo book bargain in the world, $25 for a huge book, beautifully printed, with hundreds of large, wonderful photographs!