Having owned both the C4s and the Sapphires I feel that they are more similar than different. The C4 due to its sheer size and driver array does lend itself to rather large listening rooms nicely. On the other hand the Sapphire is easier to integrate with more room options and sounds equally incredible. Lack of weight/bass is not a word I would use to describe the Sapphire. I think those whom wait for the professional reviews of the Sapphire to come out before they purchase/or go to listen at their local dealers are going to miss the boat. My understanding is that over 3/4 of the entire production run is already reserved.
(Next Level AV in Chicago Suburbs has them on display with a SimAudio Evolution stack.)
(Next Level AV in Chicago Suburbs has them on display with a SimAudio Evolution stack.)