1. How can different people hear different things from different components listening to the same system in the same room? Perhaps these people have heard some of the gear previously and have a clear idea in their mind's ear what it should sound like, and are hearing new things up or down stream as a result of the unfamiliar piece in the system. Or they are full of horse pucky...
2. Harbeths definitely are voiced differently than the Adagios. I like Harbeth's, but some think they are overly warm and euphonious in the mids, and that their resonant cabinets make all recordings start to sound the same - like the box. Others bliss out on all the musicality. You should give a listen in your system if you can - I suggest the Compact 7's.