My boss has a 2.2d 163bhp, its fine for everything you'd want day to day, but won't be setting your world on fire.
Interior is really nice, as you'd expect, he had a problem with water ingress in the boot. He had it fixed on warranty, bill was a shocker as Jag specified a new carpet, battery and rear loom

. However, fixing it yourself wouldn't have cost anything like that much lol.
In terms of other knowledge...The XF was face-lifted in 2011, main visual change was the nose, but the important change was the move from 6 speed to 8 speed ZF transmission, supposedly gives a better ride and about 10% better fuel economy on any like for like engine.
Some folks reckon that the seats in the PFL are uncomfortable due to a lack of lumbar support and a bar that runs across the bottom of the seat back. Guess you'd have to try it and see if you notice it. 3.0v6 petrols are the unloved choice in the engine range and offer good value if you can live with c28mpg, or have a very competent lpg installer who can set one up properly. From what I've read, I understand they're a bit of a pig to do.
Will post anything else that springs to mind.