I heard a lot of the speakers you are mentioning (the Guarnieri, Stradivari, WP8, MAXX2, Schweikert VR9SE...) but not the Kharma. For my taste, the Mini beat them all (except for the visual aspect, for which the Sonus Faber cannot be beaten). In particular I loved their huge imaging (close your eyes and you think you are listening to a huge speaker set), their linearity and analytic side. If you have the right upstream components, you will feel like you are "there" Even if they don't go really below 40Hz, I preferred also the ported bass (much cleaner and tighter than all vented competitors). I listened to them driven by a ARC REF3-REF610, in a small room. Was a perfect combination. If your room is small, need to have enough absorbent on the walls as they radiate quite a lot of energy.
The Mini were originally not on my shopping list (was rather planning to buy a much bigger speaker) but I listened to them by chance and was so blown away that I ordered one pair
For the moment, I don't plan to use them with subwoofers (not much instruments playing below 40hz if you listen mainly to jazz and classical). Out of curiosity, Alexc, which subs were used in your listening session of the mini? (besides the Wilson Benesch Torus, I cannot imagine a sub fast enough to integrate properly with the woofer of the Mini)
PS: Current price is $22k. It goes up to $26,400 as of January 1st
PS2: the upper model in the Magico range (the Tower, for twice the price of the mini) will not be ready on time for CES