luxury

Can someone please point out the difference in XF models, where I live, we have: - Luxury 3.0 in V6 petrol only - Premium Luxury in 3.0 V6 petrol and 4.2 petrol V8 - Portfolio in 4.2 petrol V8 and SV8 What's the main difference in the Premium Luxury and the Portfolio (apart from engine options)