Von Schweikert speakers..

Hello ladies and gentlemen. I would be interested in hearing any feedback from folks who either own or have done A/B comparisons between the Von Schweikerts (any models but specifically the VR4 SR MKIIs or VR4 JR MKIIs) and the Wilson puppies and sophias or the B&W 802Ds. For those of you who own them I would be interested in hearing which amplifiers you chose to drive them and why. Thanks in advance.