I just took delivery of my 2017 S 60, and the Sport mode steering has a bit of an issue. The best way for me to describe it is that, when driving straight, the wheel feels fine; then if I start turning the wheel, the first 1/8 of the turn feels mushy, imprecise, and somewhat lacking responsiveness. When I get to almost about 1/4 of a turn or more the wheel feels as it should. Tight, responsive, precise, and connected to the road. The car has stock tires, can't remember the brand. I fully understand that it could be a software issue as well as a tire or wheel alighnment, toe in, or camber problem.
I have a punch list of other minor items and will be taking the car to the SC soon.