I know very well Metronome because I am very friend with Italian distributor and listened in his shop all the products, listened very well Aqwo2 and I like a lots,i have a Kalista dream play one.
For me Metronome and Kalista has among the most natural digital sound
I listened many times in an other shop near me Esoteric and I don't like, has a good sound but very naturally also listened the Grandioso serie but don't like a lot, for the price also.
I listened K01 and K 01X and I prefer more Aqwo and Aqwo 2
but never listened the new XD