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I think you need to test drive some different models and make your own judgement. I have a 640 ix GT with Sport package which came with 19" wheels in the US. After test driving a few 7 series models I bought the 640 but put the 18" wheels and tires of a 7 series on my car. I was really impressed with the 7 series ride quality which is luxurious and absorbs bad roads with ease. I would of not bothered if I hadn't almost bought a 7 series. I bought the 6 series for the boot space and versatility.
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