As much as I like diesel I don't know if someone who can afford a new Land Rover really desires a diesel here considering the difficultly of finding diesel in every gas station.
From my dealing most folks with a Land Rover and similar tend to do a company leases and have a company gas card. They're more about convenience than optimizing fuel economy or the added torque a diesel engine provides.
Winter diesel prices vs gasoline prices seem to be getting greater every year also. Offsetting the adding driving distance diesel fuel also provides as a savings.
N.B. - I noticed higher diesel uptake here seem to be buyers with some connection to Europe. Understandable considering diesel acceptance in Europe vs old N.A. view of black, dirty and smelly exhaust.
All anecdotal and observational of course.