Unfortunately my only comparison is with my E36 which isn't particularly fair. I have a much stiffer suspension on the my E36 and designed more for drivability than comfort. E70 is leaps and bounds more comfortable and quiet.

On Toothbrush's note, switching from winter to summer tires on my E36 cuts road noise by like 60-70%. It goes from thinking all my bearings are about to blow to the left rear has just started to grumble.

Sunroof will also make a difference.

This isn't even a fair comparison but since you mentioned other SUVs, my wife's parents got an '06 Explorer about a year before we got our '08 4.8 X5. Every single thing is smoother, more comfortable, and more refined on the X5.

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'08 X5 4.8i - 196k
'15 i3 REX - 95k - Blown AC compressor

'98 323is - 170k - Garaged
'94 325i - 208k - Sold