well, went with the knowledge of the salesman. He seemed to genuinely know each of the products. He said he thought the Sony were more bassy, and the treble wasn't harsh. So I went with them.
Been listening to them for half an hour, and I'm seriously impressed. Big bass (but not overpowering), punchy, clarity, sweet treble. They sound better than I was expecting. They are very comfortable. They possibly sound better than my akg y50's. Very happy indeed.