I believe Sandu (Soundnews) is cooking up some shoot-out you might be interested in. Keep an eye in the next few months.It would be great if there was some kind of 'shoot-out' between these amps-- or some more comparisons/description generally. Guess it's hard to find the wherewithal and time/expense commitment to do a 'meta' test like that.
MidFi Guy on youtube did some series of comparisons aswell, i really enjoyed those.