Realism of and engaging quality of vocals is probably the most important element for me in a sound system. But this is where, I believe, synergy plays such a big part. Denon and Triangle give it in spades for these ears and brain. Audiolab didn't give me that particular fix. Wondering about Arcam ....I think we are getting cross wires. The A29 is, I was referring to the A39 being to deep for my unit.
One last thing I'll say, is the vocals seem very natural with Arcam almost like they are in the room, it all sounds very natural to me anyway.