Recently had my car in for the 37,500 mile service and got a brand new (24 miles on odometer) 75D Loaner with AP2 hardware. First thing I noticed was that for about the first 100 miles it would not allow me to use both the autopilot as well as cruise control with the message that it was calibrating the cameras (when I got my car it did not have this calibration required for the cruise portion and I had gotten it before the autopilot 1 hardware was activated over OTA update). After the cameras were calibrated both the TACC and autopilot 2 became available. One thing I noticed was that AP2 seemed to have a longer trailing distance from the vehicle ahead for the same setting in AP1 (I typically have used trailing length 1 in my car, in this car it seemed that the 1 setting was more equivalent to a trailing length 3 setting in my car). When using the turn signal while on Autopilot the car made a sharper change into the adjacent lane (honestly I think I prefer AP1 over this which is a smoother/more gradual shift to the next lane). At the time of the loaner the newest update which touted smoother algorithm for AP2 was available and I presumed equipped in this car. I would say it was very similar to AP1 in this respect of staying in center of the lane. I did not try the other features for comparison like parallel/perpendicular parking so have no comments on this.