Well here goes. Had 260 2004 -09 52k miles driven. Then 2.7 xf then 3.0 xfs now ztt 260 mk2.
Both 260s stock and drive pretty much the same. 22,000 and 42,000 miles covered in jags, Heavyish clutch but not too bad. Chassis amazing, sound gorgeous, cabin businesslike. Jags. Silky,smooth quiet and great auto box. But too sanitised. The jag v8 sounds like a sewing machine. Almost Teutonic. The jag s diesel 0-60 in 6 sec but nowhere as involving as 260.
Jags better internal finish and luxury than zt but rover 75 close to jag on that. For me R75 box too slow acting.
All of these cars miles ahead of the mainstream.