700 is a nice price for V2 - do not hesitate
The cheapest I could find on hifishark.com is 749 euros, from Germany.
But the headband is disgusting, greasy and discoloured. Also you have to add the shipping costs.
Also you have to send that amount of money to an
unknown private person from a different country, which is not a really good feeling, let's be honest. If the currency is different, there is also exchange rate, and bank transfer fees, which also adds cost. If non E.U. country (like U.K.) then import fees + taxes may be applied. So rather 900+ euros is more realistic, for a nice one+shipping cost. There is the risk of fraud or transport damage. But if you check it from time to time, you might find a nice one for a bit less even locally, you never know. I prefer to buy locally, to check it out myself. If there is a good one in Vienna or Munich, a reasonable distance I can travel to check it out and take it home. I do some sightseeing as well. I just don't like to send hundreds of euros to unknown private individuals.
In contrast I could buy the AKG for HUF 240000 (580 euros) locally (1 hour away with public transport), in mint condition. I could try it out. So yeah, maybe the HE1000V2 can be a little bit better, depending on taste, but also more expensive. Locally there was one nice HE1000V2 stealth a while ago for HUF 400000 (966 euros). 66% more money and probably not that much better headphone.
If the composer is too expensive for you, and you are not sure that you will be satisfied with the performance of the K812, then there is the HE1000V2 as a realistic alternative.