The Sonata is technically defined by the EPA as a large car but is marketed as a mid-size car, against vehicles like the Volkswagen Passat, Honda Accord, Subaru Legacy, Nissan Altima, and Ford Fusion.
The Sonata is 191.1 inches long, and it does more with its dimensions than even the Honda Accord, which is longer, but less spacious. The Sonata has the same wheelbase as the Passat, at 110.4 inches, but packages in more people and cargo space than the Volkswagen—barely. Inside, there's a total of 122.4 cubic feet of space, split between 106.1 cubic feet for the humans and 16.3 cubic feet for cargo.
Off the spec sheet, there's very good space for 6-footers in the front seats, and the seats are are well bolstered, especially in the 2.0T Sport model. A power passenger seat can be had, though it's only offered on upper trim levels, where you'll also find heated and ventilated seats and a serviceable grade of leather upholstery.
The Sonata's positively awash in storage bins, perfect for hiding stuff from drivers and passengers. The covered bin ahead of the shifter tucks away USB and power points, and there's a handy rubber-lined bin to the right of the lever that's made for smartphones. The console and glove box are deep enough for stowing tablets. Cupholders, door pockets, a trunk with pulldowns for the rear seat inside the trunk itself—it's all where you need it.
In back, a 6-footer has plenty of knee room behind another 6-footer, enough, in fact, to cross over a knee into a freestyle yoga pose. The back seat leg room isn't quite as expansive as in a Passat, but head room is like most of the cars in this segment—a little snug when the sunroof is ordered, but fine for anyone under 6-feet tall.
A strong structure and plenty of sound deadening material make the Sonata quiet at a good driving pace, plenty quiet for normal conversation.