Range Rover sport SDV8 vs SDV6 HEV?

[jetsetwilly2000]

My Discovery 4 is great but makes the missus sick, so looking around for something less boaty. Range Rover Sport L494 is in my sights, but can't decide between SDV8 and SDV6 HEV. Has anyone driven both? How do they compare in terms of performance, noise, MPG and handling? Only real-world firsthand experience please - I've already read and watched everything I can find.