| Model Year | 2012 | 2023 | |
| Model | BMW 3-Series | Mercedes-Benz SL | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 2dr Hardtop conv. | 2dr Convertible | |
| Difference | |||
| Wheelbase | 108.7 in | 106.3 in | 2.4 in |
| Length | 180.6 in | 185.2 in | -4.6 in |
| Width | 70.2 in | 75.4 in | -5.2 in |
| Height | 54.5 in | 53.5 in | 1 in |
| Curb Weight | 3792 lb. | 3990 lb. | -198 lb. |
| Fuel Capacity | 16.1 gal. | 18.5 gal. | -2.4 gal. |
| Headroom, Row 1 | 38.0 in | 37.7 in | 0.3 in |
| Shoulder Room, Row 1 | 55.3 in | 56.3 in | -1 in |
| Legroom, Row 1 | 41.8 in | 41.5 in | 0.3 in |
| Headroom, Row 2 | 36.5 in | 32.7 in | 3.8 in |
| Shoulder Room, Row 2 | 49.3 in | 44.1 in | 5.2 in |
| Legroom, Row 2 | 31.9 in | 0.0 in | 31.9 in |
| Total Legroom | 73.7 in (over 2 rows) | 41.5 in (over 1 rows) | 32.2 in |
| Cargo Volume, Minimum | 9.0 ft3 | 7.5 ft3 | 1.5 ft3 |
| Cargo Volume, Maximum | 12.2 ft3 | 7.5 ft3 | 4.7 ft3 |
| 2012 BMW 3-Series Seat Room and Comfort: Pros | ||
| Year | Comment | |
| 2012 | Another surprising strength for the new BMW 3-Series. There's more room in back than in competing cars, and the seat is comfortably positioned and shaped. see full BMW 3-Series review | |
None of our members have yet commented on the seat room and comfort of the 2012 BMW 3-Series.
None of our members have yet commented on the seat room and comfort of the 2023 Mercedes-Benz SL.