I don’t know if its a flagship but I have the Sony MDR-MA900 I have been using for a few months now. It turns out they sound the best to me out of all the others I have tried and I have now started selling off my other headphones and keeping these one and some KSC75s if I need a portable headphone.

Sony MDR-MA900. For a long time nothing dethroned my KSC75x on a Porta Pro band, not the 6XX or the Tygr300r. These are a bit older but they are so light you barely feel like they are on your head. They are also the first headphones I have used that go over my big ass ears comfortably. I use them for everything. The bass is punchy and the treble is present but never shrill. The only gripe I have is that the cable is like extra long but I think a cable mod is in its future. Maybe I will make them balanced but I don’t know if that will mess with the sound signature.