I really love Gianni's art. There'a a lot of Wyeth in his his paintings. His pen and ink is superb as well. In addition to the SK volume, he also did the illustrations for the Bran Mak Morn one and the second of the three Conan volumes.
Wandering Star had some very ambitious plans - they wanted to publish the complete works of REH, with the purest texts, in these deluxe limited editons. Unfortunately, they ran out of steam (and money) and had to give it up after a handful of volumes. The biggest complaint was that they had only done two of the three Conan volumes and so once again it looked like we would never get all the Conan stories in a nice hb set (Donald Grant's 1970's series was also left unfinished). Finally last year they completed the third Conan, much to everyone's relief, though it took some financial backing from a UK bookseller.
Subterranean Press has taken over and are continuing the series of illustrated limited editons and what they aren't publishing, the REH Foundation will. Annihilus,
the Del Rey tpbs that I linked you to earlier are the mass market version of these limited editions.
The whole story behind the publication of these volumes is an interesting saga in it's own right. Here a piece I did about it when Conan vol. 3 finally came out:
A Book Too Far: The Savage Tale of the Wandering Star Limited Editions