sup rjt65,
definitely there are differences in 3 rides.
Mercedes S550 ---> more like a limo ride, but with power of a sports car. it's fast, but luxury style. HUGE backseats.
Mercedes C300 ---> new sports style. and of course 4 wheel drive. makes the car more stability in controls.
and now this ES350 ---> a bit softer and smoother than others...as it's not designed for a sports car... :) i'll let you know more as time progresses and as i will spend more time with ES350.