As much as performance and dynamics are a strength for the Infiniti G Sedans, their seating, cabin space, and refinement in general are all weak links.
The G Sedan's interior feels sporty and premium but not at all lavish. That's not to say the seats aren't bad; they deliver good support and are nicely contoured (perhaps a little snug for some). In back there's adequate legroom, though in keeping with the almost coupe-like roofline, headroom is somewhat scarce and it's probably not the sort of place where adults will want to be spending much time.
Trunk space is quite good. But while many other sedans have fold forward rear seatbacks, there's no such feature here; instead, you do get a ski pass-through.
Fit and finish are good, but there's a lot of noise, vibration, and coarseness, from the road and from the engine. The G Sedan rides more like a sport coupe, too, jittery but not downright jarring.