I give Japanese car makers credit for building such reliable vehicles but what BMW and Mercedes vehicles have in them compared to their Japanese rivals, you realize that if you want a true premium vehicle, BMW or Benz is where it's at.I think Consumer Reports and JD Power (BTW, it is not Powers) put out a list of the most reliable auto makers every year. They take data for actual owners so I would imagine their info would be the most accurate.
My father had a Lexus and a MB at the same time and by far the Lexus was much more reliable... but he still loved his E-class. As for me, I wasn't very impressed with the E-class. It was nice and all but I don't think it was worth the $50+K he paid for it back in 2003.
Lexus is stepping up but they have a while to go before they become anything like BMW or Benz.
What Lexus model did your father own?