| Model Year | 2009 | 2015 | |
| Model | Infiniti M | Audi A8 / S8 | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr Sedan | 4dr Sedan | |
| Difference | |||
| Wheelbase | 114.2 in | 117.8 in | -3.6 in |
| Length | 192.6 in | 202.2 in | -9.6 in |
| Width | 70.8 in | 76.7 in | -5.9 in |
| Height | 59.4 in | 57.5 in | 1.9 in |
| Curb Weight | 3857 lb. | 4365 lb. | -508 lb. |
| Fuel Capacity | 20.0 gal. | 21.7 gal. | -1.7 gal. |
| Headroom, Row 1 | 39.6 in | 37.2 in | 2.4 in |
| Shoulder Room, Row 1 | 58.2 in | 59.1 in | -0.9 in |
| Hip Room, Row 1 | 55.1 in | 0.0 in | 55.1 in |
| Legroom, Row 1 | 44.2 in | 41.4 in | 2.8 in |
| Headroom, Row 2 | 37.8 in | 38.1 in | -0.3 in |
| Shoulder Room, Row 2 | 56.9 in | 57.8 in | -0.9 in |
| Hip Room, Row 2 | 53.9 in | 0.0 in | 53.9 in |
| Legroom, Row 2 | 37.3 in | 38.7 in | -1.4 in |
| Total Legroom | 81.5 in (over 2 rows) | 80.1 in (over 2 rows) | 1.4 in |
| Cargo Volume | 14.9 ft3 | 14.2 ft3 | 0.7 ft3 |
| 2009 Infiniti M Seat Room and Comfort: Pros | ||
| Year | Body/Powertrain | Comment |
| 2009 | 4dr Sedan 325-horsepower 4.5L V8 5-speed shiftable automatic AWD |
Huge rear seat with tons of space. Passengers routinly comment on how comfortable it is. Significantly more rear seat room then 5 series BMW. Ininiti G35/37 has more rear seat than the 5 series. see full Infiniti M review |
| 2008 | 4dr Sedan 275-horsepower 3.5L V6 5-speed shiftable automatic AWD |
The front seats are better padded than the 2006 and more comfortable see full Infiniti M review |
| 2008 | 4dr Sedan 275-horsepower 3.5L V6 5-speed shiftable automatic RWD |
I sit very tall, and have lots of headroom in this car see full Infiniti M review |
| 2008 | 4dr Sedan 275-horsepower 3.5L V6 5-speed shiftable automatic RWD |
lots of leg space. very comfortable seats see full Infiniti M review |
| 2008 | 4dr Sedan 275-horsepower 3.5L V6 5-speed shiftable automatic AWD |
Ample, yet feels built for speed see full Infiniti M review |
None of our members have yet commented on the seat room and comfort of the 2015 Audi A8 / S8.