| Model Year | 2020 | 2021 | |
| Model | Mercedes-Benz GLB | BMW Z4 | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr SUV | 2dr Convertible | |
| Difference | |||
| Wheelbase | 2,830 mm | 2,469 mm | 0 mm |
| Length | 4,633 mm | 4,336 mm | 0 mm |
| Width | 1,834 mm | 1,864 mm | 0 mm |
| Height | 1,659 mm | 1,306 mm | 0 mm |
| Curb Weight | 1,650 kg | 1,491 kg | 0 kg |
| Fuel Capacity | 60 L | 52 L | 8 L |
| Headroom, Row 1 | 1,034 mm | 988 mm | -987 mm |
| Shoulder Room, Row 1 | 1,420 mm | 1,379 mm | 0 mm |
| Legroom, Row 1 | 1,044 mm | 1,072 mm | 0 mm |
| Headroom, Row 2 | 998 mm | 0 mm | 998 mm |
| Shoulder Room, Row 2 | 1,394 mm | 0 mm | 1 mm |
| Legroom, Row 2 | 968 mm | 0 mm | 968 mm |
| Headroom, Row 3 | 884 mm | 0 mm | 884 mm |
| Shoulder Room, Row 3 | 1,113 mm | 0 mm | 1 mm |
| Legroom, Row 3 | 739 mm | 0 mm | 739 mm |
| Total Legroom | 2,751 mm (over 3 rows) | 1,072 mm (over 1 row) | 1 mm |
| Cargo Volume, Minimum | 623 L | 280 L | 343 L |
| Cargo Volume, Maximum | 1,756 L | 9.9 | -8.9 L |
None of our members have yet commented on the seat room and comfort of the 2020 Mercedes-Benz GLB.
None of our members have yet commented on the seat room and comfort of the 2021 BMW Z4.