Real owners rate these about evenly: 63% of 27 ATH-R70xa owners recommend it, vs 58% of 93 for the Sennheiser HD 620S.
Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score
“I listened to a bunch of highly rated headphones at the last CanJam in NYC and none of them made me want to upgrade from the R70xa.”— this_is_me_drunk on Reddit
“I got the r70xa as well, but had to get a new amp to give it more juice to make it sing. But man, being so light i hardly reach for my other cans now and using these as daily drivers.”— Waste_Search2125 on Reddit
“it has this really arfticial, unnatural sound to it that's neither analytic nor is it a smooth, rich entertaining sound”— Overall-Cupcake7073 on Reddit
“Just got my 620s yesterday, I like it, which is saying a lot for a closed back. I think it’s easily one of the best closed back headphones not only in the price range, just in general.”— MoonWun_ on Reddit
“Crazy enough, the HD800s and the HD620s share the top spot in my endgame headphones. And the price difference is over €1,000. I just can’t believe what the HD620s deliver for €279.”— No-Desk-1808 on Reddit
“I think technically the 620s but the design of the ear cups means they have this bit that protrudes into the ear cups (I think the anchor for the headband) and it’s quite uncomfortable (at least for me).”— gussic on Reddit