How was your test drive comparison of both cars?
I test drove 2 GS 2013 models used about 12k lease returns and I noticed slight steering wheel vibrations on both of them. One had Dunlop tires and the other Goodyears...the dealership kind of shrugged it of as if I was crazy. I know my cars, I drive a lot and also do a lot of work on them as well.
What got me on the ES test drives was the comfort and larger rear seating space and also no front end vibration. Yes given that the GS is a rear wheel drive as compared to the front wheel drive electric steering ES, some might say apples and oranges. For me it was just the experience of vibration which I am very weary of in a luxury car.
Otherwise, please describe your future driving experiences with your brand new GS!