420i M-Sport from Budget, 640d M-Sport from Thrifty, M4 from Thrifty, 740d from Thrifty, 435i from Thrifty, 320d from Sixt UK... all had it. Don't know if the option is standard or not in the 640/740.
It's standard on the 6 and above and common enough on the M4 but I am amazed you've found it so often on 3's and 4's. So amazed I have to ask if you are confusing it for something else... we are talking about the actual dash in leather not the centre console and door cards?
It's almost a £1000 option and has no effect on residuals so I can think of no reason why it would be specified as an additional option on rental 320d's. They are mostly BMW UK registered cars that turn up as approved used later on - if they were being ordered with a leather dash in sufficient volume for you to continually receive them where are they on the AUC site?
When I booked a 520, they gave me an E-Class and I couldn't stand the thing... that horrible to be a driver of, you have to assume the old man driving style and have nowhere to rest your elbows... comfy enough for the passengers though.
Agree completely, I am not a fan of the E Class interior especially compared with the 5 Series. I suspect though that the new E Class, due next year, will be very nice.