Ayre QX-5 vs Lumin vs dCS Bartok

Surprised this thread didn't go further.  I own the AX5/20 (selling as I have the Vandersteen HP5 amps in bound).  I owned the QX5/20 and LOVED it for so many reasons.  Just a great digital hub that sounds great.  The Lumin is also a great DAC and I agree with the first posters answer in the differences. I personally like how 'fast' the Ayre gear is.  It is so revealing.  Whenever I change out and try something else, I realize that over the long haul, I love how detailed and still musical the Ayre gear is.  Personal choice and I'd be happy with either.  

I have auditioned the Bartok on many occasions and feel it also is a nice DAC and worth the price of admission.  I don't feel it's better than the QX5/20 though.  

I"ve heard it in uber systems and it's a great DAC/digital front end.  I will scale with better equipment to a very high level.

Funny thing is that I don't know anyone who have heard the QX5/20 not enjoy it and feel that it punches well beyond it's price range.  There is a reason that Ayre is taking it's time with a reference DAC.