They both are excellent speakers. But I felt the Sig 805 was a fuller sound, and seemed to appear "larger" than the 805S. I agree that rooms, and electronics could be the difference. The midrange of the sig 805 is so smooth. I honestly believe that it comes down to personal prefernce when comparing the sig 805 and the 805S. A tech personnel from B&W said that the 805S and the sig 805 each have their own strengths and weaknesses.
Also, I don't think that I'm that used to hearing a 1st order, very simple crossover that the 805S has. If B&W follows suit, about two years after the release of the line, they bring out a signature speaker. When talking with people, they felt that the diamond tweeter was just too expensive for a possible signature 805. My personal feeling: they will put it in. They are going to give the public what they want. But, I wouldn't be surprised if we saw a price tag of 4500-5000 dollars.
Also, I don't think that I'm that used to hearing a 1st order, very simple crossover that the 805S has. If B&W follows suit, about two years after the release of the line, they bring out a signature speaker. When talking with people, they felt that the diamond tweeter was just too expensive for a possible signature 805. My personal feeling: they will put it in. They are going to give the public what they want. But, I wouldn't be surprised if we saw a price tag of 4500-5000 dollars.