You don't say what car you currently I don't think... Depends what you are moving from I suppose and what your realistic expectations are. I found the 2014 model offers a better ride than my CT from the previous year. I didn't drive the F-Sport but I think if you are taking the improved ride of the new model as a baseline you have to expect the ride to be firmer. After all, that is partly the point of the F-Sport in the first place. In the absence of any performance upgrades, they are offering better handling which, unfortunately, often comes at the expense of comfort. This is true in a £10000 hot hatch to a £100,000 sports car. Take a drive in a lot of German cars without the pretence of sporting abilities and you will find them surprisingly firm.
Find a dealer who is willing to let you take the car out on your own and try it for size. It comes down to what kind of driving you are going to do and how important comfort is... I think the talk of different wheel sizes, while absolutely valid and good advice, goes against what the F-Sport is about unless you absolutely must have the bodykit. Plump for the Premier instead if that is the case - you at least get better equipment with that!