I personally believe that sport and non-sport versions of the X5 drive very differently.
I personally love the combination of luxury, handling, acceleration, and utilitarian functionality (hauling stuff) that our '13 35i M-Sport E70 has.
If I had a base version of the X5, I would feel very different. If I didn't have all of the options we have, I would feel very different. The F15 is also way quieter and in no way do you feel as connected to the road as in an E70 (steering and suspension, specifically).
I couldn't love the X3, it was slightly too small for us, and very similarly sized when compared to our F30.
Anyhow, my $.02
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