The 2012 Sonata is dimensionally one of the largest mid-size sedans, and by EPA rules it's actually classified as a "large" car, with 120 cubic feet of interior and trunk space.
So it's probably not surprising that the Sonata has accommodations that are quite good for those in back as well as in front. The back seat sits at a good angle of recline, with enough headroom for all but the tallest passengers, and there's decent legroom. Both of the upholstery options are pleasing, but we like the textured fabric, and its soft-but-rugged sportswear feel, a bit better--and it seems to work better with the bolstering of the front seats. In any case, front-seat lower cushions are a bit on the firm side.
Ride quality is also somewhat firm, compared to other mid-size sedans, but road noise is very well isolated. Keep in mind that the SE's monotube shocks and 19-inch wheels will make the ride uncomfortable for those who commute over very choppy road surfaces.
The 16.4-cubic-foot trunk is about as large as that in the Ford Fusion, and the trunk gets larger when the rear seats are flipped forward. In the cabin, a deep center console and glovebox hide valuable goods; there’s a niche near the audio controls for cellphones, a flat open bin in front of it for clutter, and a bin hidden behind a flip-down lid to conceal other goods—perhaps a radar detector? Coat hooks, dual power points, and eight cupholders cover needs as vast as looking sharp for the meeting, or staying hydrated after the workout.