Linaeum,
As a Focus Audio dealer, I can tell you that the WB ARC and the SF Cremona Auditor are the two most common speakers that people are considering when they come to get a Focus FS688 demonstration. Anecdotally, I successfully sell the FS688 about half the time...so you might conclude from that that they are all in the same league performance-wise, and it might come down to personal tastes. Or it may come down to what gear you use it with and the synergies (SF Cremona Auditor is a 4ohm speaker, WB ARC is 6ohm, Focus FS688 is 8ohm). I've heard all three, and as a Focus dealer, you can imagine my preference ;-)
As a Focus Audio dealer, I can tell you that the WB ARC and the SF Cremona Auditor are the two most common speakers that people are considering when they come to get a Focus FS688 demonstration. Anecdotally, I successfully sell the FS688 about half the time...so you might conclude from that that they are all in the same league performance-wise, and it might come down to personal tastes. Or it may come down to what gear you use it with and the synergies (SF Cremona Auditor is a 4ohm speaker, WB ARC is 6ohm, Focus FS688 is 8ohm). I've heard all three, and as a Focus dealer, you can imagine my preference ;-)