So a few more details and thoughts:
I've moved from a late model 350z (manual) to the XK because I fancied an auto as most of my driving is around town and in rush hour traffic.
Yep it is a paddle shift 6 speed auto, a ZF unit I understand. Very good in full auto around town, the torque of the v8 makes it a very comfortable place to be. Obviously very different to a manual Z, but to honest for the driving I do daily it much better suited.
Again a very different place to be inside, all leather dash, centre console and transmission tunnel/ door cards (compared to Jap plastic on the Z). The Sat Nav takes full postcode which after the Nissan unit is a joy. Doesn't have MP3/ ipod connectivity as standard which is a bit disappointing - it was a £350 option i believe. Bluetooth is a bit shocking, but I never usually connect, and it can't play music bia BT so not the best.
The rear seats are all but useless for anything other than extra storage space, will probably look at taking them out and putting in storage nets, could be good to hold the golf trolley.
Handling is again obviously very different, it is a very strong GT car compared to the Z. I missed being able to chuck it around roundabouts etc this morning and it as expected it wallows around. Road noise is superb compared to the Z which wasn't very quiet due to the open boot design.
Will update with thoughts after a couple of weeks.