I don't buy them for sport, per se - it's just that for the most part the "sport"-oriented winter tires tend to feel less like you're driving on 4 marshmallows when the roads are dry - which for me, most winters, is most of the time.
My first Gen X-Ice's handled as well or better than the "sport" Kumhos that were on there before and were very impressive on the snow and ice where the Kumhos were just mediocre. They also lasted two full seasons longer. Very smooth and quiet too. But I'm on 195/55's on a light car so I think that plays a bit of a role.
The current answer to the question "What are the best tires" is now going to be: "Well, that depends".
10 years ago the answer would have been "Blizzak" and the discussion was over. Now it depends on what your driving patterns, typical road conditions, class of car, etc.
That said, given how much I liked my X-Ice's I'd buy them if money wasn't an option.