Forget the looks, which is more capable out of the box, D4 or D5?
	
	
		There are quite a few subjective statements here, and given "beauty is in the eye of the beholder", can understand. However, I prefer to look at the specs which matter the most when determining if it is more capable:
1. D5 is circa 400kg lighter
2. D5 has less clearance (284mm vs 310mm)
3. D5 has a longer wheelbase (2923mm vs 2883mm), which would imply longer rear/front overhangs as the car is circa 130mm longer
4. D5 has a higher wading depth (900m vs 700mm)
5. D5 has Terrain Response 2 as an option (or is it standard?). But is TR2 just an automated version of TR1 or an upgrade?
So based on these facts, any weight saving is offset by lower clearance and angles (approach/ramp-over/departure). I am not convinced the increase in wading depth will matter much as you would be at a severe risk of floating if you start to approach those depths, especially if there is a current. TR2 will only matter if it is an upgrade, not just an automated version of TR1. Both can come with 19 inch rims, so this is a moot point.
So which is more capable out of the box? Tough call. On sand, I say the D5 as it is lighter. On rutted tracks, I say the D4 given its greater clearance/angles, but that's just the theory. My 4wd club (Range Rover Club of NSW) will get the keys to a D5 in a few weeks and will be comparing it against other unmodified Discoveries, including my D4. We shall find out then............... :-) 
Mario