I owned the Duke 2's for a short while when I was comparing them to Harbeth HL5's and JM Reynaud Bliss Silvers. My preference in order was:
1) JM Reynaud
2) Marten
3) Harbeth
The Bliss Silvers sounded more natural to me vs the other two. Duke 2 is not a bad speaker, but pretty hefty in price compared to other speakers out there.