B&W 685's Vs KEF LS50

B&W definitely different sound signature than KEF.

KEF is more neutral with uniform dispersion, B&W has very British sound with tipped up upper bass and highs and a BBC dip in the crossover region. Closest with a similar sound signature would be the new Paradigm Prestige and Persona lines. Kef is more similar in terms of sound signature to Focal or Revel, although more rolled off.

Important correction-I have the 686's not 685's
Thanks everyone for their input, here's my final consensus: I did break down and purchase a pair of LS50's directly from KEF USA. Although the KEF LS50's have remarkable clean sound and a good soundstage I was kind of underwhelmed when compared the the B&W's.
I gave them a good long break-in and listen, tried different placement, etc. but in the end the B&W 685's had a much richer and full sound, not just to ears but a couple of guest listeners as well. The sound stage was broader and more inclusive of mid-range and vocal/guitar notes. 
I'm not saying they aren't good just not a big improvement, more of a lateral move if you know what I mean.
I also found that at least for my ears, the KEF's gave me high frequency listening fatigue at high volume after about an hour that I never get from B&W.  
The B&W's are back up, and for now will stay there until I can afford to move up to something that is a more incremental and dramatic improvement.  
Thanks,
Eric

Embarrassing but I must correct again-I have the 685's not the 686's