BMWs were always so good because they combined almost the comfort of a Mercedes with good 'feel' and tightness, but from personal experience I think sport suspension is a shade too far. Good fun when you want to fling it about, and at a decent speed, but a low speeds over less than smooth roads it's merely uncomfortable. But it's personal taste, as you say.
Haven't ridden in or driven an ugly boat on wheels, er, E60, so can't comment on what those are like, but people seem to be saying they're a bit firm.