Right tomorrow I am testing the BMW f10 3.0 Diesel estate in M-Sport guise. Although mine is on order as the 550i m sport.
I will be getting straight out of my E90 M3, so I will be able to "put to bed" from my point of view this "Steering issue". I will try it in all modes ( M-Sport) and report back. One thing I have been assured of is it's NOT as bad as some have said; this will be checked out tomorrow.