I test drove both the I4 and the V6, mind you, the V6 was impressive, but the I4 has plenty of power for everyday driving, both city and highway.
Very comfortable car. I test drove 7 different full-size cars and only the Accord was in the same "league" as the Sonata, plus the Sonata was approx $4000 less than a similarily equipped Accord.
I have had the car approximately 1.5 years now and it is still as solid as the day I drove it off the lot. I recently had to have body work done due to stone chips, I had a 2009 Mitsubishi Gallant and was horrible...sounded like a go-kart..no comparison
Very comfortable seats...can drive for hours with no discomfort unlike other cars I have driven.