You would like to change your Bosendorfer VC2? You gonna miss it! Personally haven't listen to both as they have no formal dealer in HK but from personal judgement I'll prefer Acapella Fidellio III as I am a bit concern about the ceramic driver of Estelon which I thought too analytical for me. Alternatively, to retain some merits of the Bosendorfer VC2, you could also consider Diapason Astera or Ktema Accordo from Italy. As far as I remember you are using Wavac amplifier which I believe could handle these 2 speakers.
The latest open box description and details of the Accordo from Taiwan
Both speakers are beautifully built in Italy and are good for classical music, should be comparable to the Bosendorfer VC 2, they both cost $60,000 something including stand.