You must be joking. You must have mistaken a MDR-10RBT to be MDR-1RBT Mk2.
Personally I've tested both S1 and the real Sony MDR-1RBT Mk2 with my iPad Air 2, iPad 4, Galaxt Tab S 10.5 LTE, iPhone 6 Plus, Galaxy Note 4. Sony MDR-1RBT Mk2 SQ and comfort clearly much superior.
Out of your comments, the most laughable part was, "though the S1's bass could conceivably improve after some run-in."
Hahaha... do you even believe what you have heard or the your words type to be exact? Perhaps you want to type even more exaggerate, like the S1's bass improved by 300% after burn-in?
I know where you coming from, so your comment absolutely 0 value to all HWZ members.