I heard Wilson XLFs powered by D'Agostino Momentums in February. Both Peter McGrath and Dan D'Agostino were on hand. Cables were Opus MM2 and the installation and positioning were impeccable.
Best rig I have ever heard in every way: truth of timbre, frequency extension, resolution, soundstaging, imaging, microdynamics, macrodynamics, low level resolution, live-level SPLs.
I also heard WIlson Alexandria X-2's powered by the VTL Siegfrieds a few years ago. It was the best I'd ever heard until the XLF/D'Agostino setup. XLF bested it in low end, weight, and definition. the D'Agostinos are my favorite amp. Now all I need is to come up with $50K. :)