i can tell you for a fact that there really is no difference between the se530 and se535 execpt the detachable cables. the motors are the exact same , and so are the filters for sound quality, i will say that the wires are different but that is because they are more solid OFC based. but the wires become nasty looking (because they are transparent) after awhile.
Where you getting that? That's false.
SE530 is less accurate but more fun. Bass is a bit larger and treble a bit rolled off. SE535 is more neutral but treble extends a bit further.