Oh wow. I await that report with bated breath.
I myself had been wondering if a SCM7 (or 11) biamped with an Exposure int+pwr combo might be ahead of the (single-wired) S3/5R or SA1 driven with one amp (however classy)...
I do find the treble on my SCM11 more 'attacking' than the S3/5R. Although lately, with the improvements in the S3/5R's sound brought about by the X-A2, the possiblity has been raised that the SCM's treble may be slightly on the bright side. Check out Stereophile's measurements on the SCM11's and SA1's tweeter response, the difference between these tweeters may be a case of 'enhanced' vs 'natural'.