I hope they are a more comfortable (and affordable) version of the XM4, in which case I would like to buy them, as I don’t care about ANC.
However I can’t really find any frequency response curves or reviews by any of the known reviewers. Some random youtube videos exists, but nothing reliable when it comes to sound quality.
You should buy this because of DSEE technology:
DSEE restores high frequency sound and fine fade-out sound are restored to the track for a more authentic listening experience. You can also set music to your own taste using the EQ setting through the Sony Headphones Connect app. When an original music source is compressed, it loses the high-frequency elements that add detail and richness to a track. Our Digital Sound Enhancement Engine (DSEE) faithfully restores these to produce high-quality sound that’s closer to the original recording. I got this info from conceptkart.com