Perhaps of some relevance here - posting from "Maccur" on AVSForum.com
"I don't know about Martin Logans, but I did an in-store comparison between the two about two years ago and went with the Musical Fidelity A5 for my B&W Nautilus 804 two-channel system. The Krell just didn't seem to have the depth and soundstage of the Musical Fidelity and, like most Krells, seemed to emphasize the bass. It's been a great match with the 804s, but it might be totally different with the Martin Logans. The best advice, as always, is to try out the equipment in your home and choose what sounds best to you."
I have always liked the MF A5 a lot.