The only issue I have seen on my three weeks of owning a 4.8 is the tranny in regular drive mode does not shift smoothly on downshifts on hills all the time. There is the DS and manual modes in which this does not happen. Otherwise things are fine. I do have comfort acess and no issue at all there. It is great.

I never even looked at the ML and you will find more issues there I expect. The Lexus is a good car but too booring for me but it depends on what floats your boat. Overall I am very happy and BMW has called me twice already to check on what I thought of my purchase.