Makes real world sense and that's what I always thought but side by side the car with the 20" was taller. I'm not the only one noticing the height issue (tires irrelevant here). Check out the first customer review. http://www.edmunds.com/lexus/rx-350/2016/suv/review/
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NOT correct. No "real world sense", because lower profile tires with the 20's keep ride height same for 18" and 20" wheel versions of the new RX.
To summarize, if you are having a height issue it's not because of the optional 20's.