This is kind of where I'm at. I went and drove another XJ yesterday and it is just gorgeous inside (apart from the kinda shoddy plastics on the air vents). It was a Premium Luxury rather than a Portfolio but the odd thing is that the main screen seemed to be significantly higher resolution than the one I used in a Portfolio. I'm guessing that this is because Dual-View reduces the horizontal resolution by 50%.
TBH I don't care about Dual-View but I do care about all the other kit on the Portfolio such as cooled seats, the B&W hifi, etc. It's a pity you can't have the Portfolio without Dual-View.