You comments pretty much reflected my own thoughts LL21. It would be a tough, but not necessarily insurmountable task for a $32k speaker to reach the level of sound of a well designed $70k high end speaker providing you take the time to get to know the speaker and listen to it with different amps/setups to see which creates the best synergy. Myles was correct when he eluded to the importance of good attention to detail with upstream electronics, cables, isolation etc for the S5s. They are very accurate and revealing of the upstream gear. The S5's will clearly convey to the listener what they're being fed. If you get it right, the S5's will sound boxless, coherent, well balanced top to bottom, smooth, resolving, a touch warm & wonderfully revealing of inner detail and textural elements in the bass in particular. S5 is really remarkable in this way. But unlike the S3, to me the S5 is the more complete, well balanced speaker and the one I would take home based on my room and ear.
My advice would be, don't dismiss the S5's after just one audition. When I auditioned the S5's, I heard them in 4 different setups before making a decision including with Soulution, Dartzeel, Vitus Reference and Vitus Signature series amps. You can have a listen to some of those setups
here. The best amps I heard with the S5 were the Soulution 720/520, Dartzeel NHB-108/NHB-18NS & Vitus SIA-025/SCD-025 spinner. All these pairings produced some magic which the S5's conveyed to the listener, though ultimately I fell in love with the Vitus Sig Series.
Regarding the disappearing act, I will be adding Stillpoints Ultra 5's with Ultra bases to my S5's in the correct
sloped side up orientation soon & will report my findings. In fact, I'm picking up the U5's today
This setup might just be the last piece of the puzzle to allow the S5's to disappear in the room. A Sydney Dealer I know reported great success placing U5's under a pair of MM3's, so I am sure they will have the same benefit under my S5's. We'll see!