I only briefly drove a 14 on a test drive but it didn't feel overly stiff. When I saw the 15s had gotten a "softer" suspension I was a bit leery how it might handle. However, since I picked my Nismo up in September of 14 I would have to say that the Z is about as good as it gets in terms of out of the box handling, predictability, and comfort. Is it stiff? a bit. Does it get upset in corners if you encounter a bump? Not all. I think Nissan did a great job in setting up this chassis and I for one wouldn't change a thing.
FWIW, I have a GLC43 on order so I joined a MB forum and folks over there are complaining about 20s and 21s giving a harsh ride on air suspension. So, I think it boils down to what one can tolerate and a lot of it is personal preference.
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