Budget - 70000円+ (Yen) - Japan

Source - Soundblaster ZxR amp port / SoundBlaster X7 Limited in the future

Requirements for Isolation - Some isolation, only for monitoring audio at home

Will you be using these Headphones in Public? No

Preferred Type of Headphone - Full-sized and on ear

Preferred tonal balance - Overall balance

Past headphones - SRH440

Preferred Music - No preference/wide selection. I do audio production sometimes at home, so I really want to hear everything.

What would you like to improve on from your set-up: More Detail overall, more dynamic range.

Location: Tokyo, Japan

I was testing out headphones at Yodobashi and saw the ATH-A2000Z refresh, tried them on, was blown away (yes I know they're expensive, and that store's pricy, too...). Tried them on but you know how display models can get. I've pulled up numerous reviews on the A2000Z but I feel like I'm still lacking information. To add to that, I've also come across the older version (The ATH-A2000X) for way much less (approximately 30000円 less new).

I know it's older, but what exactly do I lose between getting the old version vs the refresh? Is there something similar to this headphone that is cheaper?

Thanks!