Sorry to disagree on the B&W issue, but I have heard both lines and currently Kef new Reference series is much more technically advanced than what B&W is offering.
The sound of the new Kef series is remarkably transparent, with a huge sound stage that a dual concentric can provide. The Kef's tweeter goes up to 60k without being bright or over analytical. In addition the Kef series can be tuned to match the room with subtitle but effective tone controls.
Both speakers have great bass and dynamics