First of all I’m not talking about small, frequency and SPL limited bookshelf speakers.20K won´t buy you good speakers even second hand? Myself, Sonus Faber, Boenicke Audio, Dali, Dynaudio, Wilson Audio, Magico, Qualio Audio etc and this link beg to differ:
Hifi adverts | audio-markt.de
www.audio-markt.de
IMHO there is only one speaker among all the speakers from the manufacturers in your list. It’s Sonus Faber Amati (the original one) and it’s not a great speaker at all. And maybe Wilson Audio Sophia (first version) sounds good up to a degree. Neither Amati nor Sophia are great sounding speakers but acceptable. Amati has bass controlling problems and softness expecting you to overcome. Sophia has the least amount of (but still have some) Wilson nasally sound with boomy bass.
Certainly no Dali, Dynaudio, Magico etc.