Exterior on 35d and 4.8 are identical on the stock models in terms of complete body color.

If you are a "spirited driver" and alone in the car most of the time, you should go with 4.8. If you dont care about that 0.5sec delay from the get-go, go with the Diesel.

However, there are incentives right now on the 4.8 (lower MF and $2500 holiday credit) which somewhat bridges the price gap between these 2 models. Of course you will also save a bundle of money on diesel vs gas, which you need to figure out for yourself.

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive