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Of course, I could put this thread another way and simply ask how can I get SOTA performance for peanuts??
Bit of a different angle, but in my experience any very good speaker that depreciates dramtically and can be found for 30% of MSRP on the used market can be a giant killer. I once owned Revel Studio (the original) for $4K, and it could easily compete with five figure "giants".
Agree with Edorr. Every audiophile's definition of SOTA may be slightly different for speakers, but 2nd hand is a great way to get there given the fast depreciation of electronics.
For me, i am a big fan of the big Wilson Xs...the X1s can be bought for less than a pair of new Sophia's if you look carefully...even including an upgrade of the Tweeter to the equivalent of the Maxx3-generation Focal and a pair of TA Ref MM2 jumpers.