| Model Year | 2015 | 2018 | |
| Model | Audi A8 / S8 | Lexus IS | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr Sedan | 4dr Sedan | |
| Difference | |||
| Wheelbase | 117.8 in | 110.2 in | 7.6 in |
| Length | 202.2 in | 184.3 in | 17.9 in |
| Width | 76.7 in | 71.3 in | 5.4 in |
| Height | 57.5 in | 56.3 in | 1.2 in |
| Curb Weight | 4365 lb. | 3583 lb. | 782 lb. |
| Fuel Capacity | 21.7 gal. | 17.4 gal. | 4.3 gal. |
| Headroom, Row 1 | 37.2 in | 38.2 in | -1 in |
| Shoulder Room, Row 1 | 59.1 in | 55.9 in | 3.2 in |
| Hip Room, Row 1 | 0.0 in | 54.3 in | -54.3 in |
| Legroom, Row 1 | 41.4 in | 44.8 in | -3.4 in |
| Headroom, Row 2 | 38.1 in | 36.9 in | 1.2 in |
| Shoulder Room, Row 2 | 57.8 in | 53.4 in | 4.4 in |
| Hip Room, Row 2 | 0.0 in | 54.0 in | -54 in |
| Legroom, Row 2 | 38.7 in | 32.2 in | 6.5 in |
| Total Legroom | 80.1 in (over 2 rows) | 77 in (over 2 rows) | 3.1 in |
| Cargo Volume | 14.2 ft3 | 10.8 ft3 | 3.4 ft3 |
None of our members have yet commented on the seat room and comfort of the 2015 Audi A8 / S8.
None of our members have yet commented on the seat room and comfort of the 2018 Lexus IS.