I've just had a major move this past weekend, and may be another week before I return to Walkman Zen. I promise to retroactively like everyone's posts
The change in sound was very noticable to me on ZM2. Not quite like a light switch, but the perceived change sinks-in in a couple of seconds. Affecting quiet parts and textures. More noticable than a cable change, less than a Swissbit. Like I said earlier, Japanese language saved my music. Subtle changes can make all the difference. I'm endgame now
I tried most of the languages very briefly, but noticed obvious differences with them all.
Thanks everyone for their insights/opinions on this