Just received my Zen 2.0 this afternoon. I will concur with previous posters that those sound best naked. I initially tried them with donuts and full cushions and was quite disappointed, overtly warm with loose bass.
Listening now naked I will agree that those are technically superior to the first version, more detailed and more open sounding.
But the original Zen with full cover still has that something special, slightly warmer with slightly lusher mids.
Longer listening time is necessary for me to decide which one I will ultimately keep.