See, I'm an at-home listener. I can't do it on the go, it cuts me off from the flow of everything that's happening around me. I also owned the HEKV2 before, and actually had a lengthy audition of it on the amp I just bought. So I got the amp first, with plans that that I could one day have an HEKV2 to pair with it. When I saw the price reduction, I couldn't resist for long.
I've written about the differences between the two headphones at length here, and from my point of view, there's much more than just a subtle difference. The Arya is amazing, and really unbeatable in tonal balance and detail for the price (especially THIS price), but the added resolution, natural staging, and warmth/organic-ness of the HEKV2 is what I've been waiting for
Edit: Just got back from some time away from home, and HOLY S***T the Arya are still so amazing! Part of me wonders if I actually need to upgrade at all now.