Totally agree with drzoidberg. I rented Sonata and Fusion in two consecutive weeks.
I picked Sonata first in the first week because of its apprearance. It looked very attractive inside and out. I was impressed, and liked the car.
The next week, no Sonata left, so I picked the Fusion. As soon as the car was out of the parking lot, man, I instantly loved this car. I liked the precise handling, the crispy ride, the powerful engine. Although it does not look as sexy as the Sonata, it drives much better than Sonata. I will choose Fusion over Sonata very time when I get the choice.