H9 3rd gen sound compared to Sennheiser HD650 Hi I am currently considering joining the B&amp;O family with the purchase of the H9 3rd gen. I am just wondering how good is the sound as compared to an open back headphones such as the HD650 from Sennheiser? 

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I have a pair of SONY WH1000XM2, Airpods Pro, and HD650 as the reference at the moment.