Just for comparisons I have included the AMuS test of the Mercedes S500 and EQS580 but this should be in Internal Combustion I guess.
Some observations:
Weight: i7 at 2744kg is 144kg heavier than the EQS580 (2600kg) and a massive 617kg heavier than the S500 (2127kg)
Interior room:
1) Norm rear seating room: Despite been the longest car at 5390mm vs 5216mm (EQS) vs 5179mm (S500) the BMW (840mm) has 40mm less legroom than the EQS (880mm) and only 30mm more than the SWB S-class (810mm), this means the LWB S-class (910mm) will have 70mm more legroom than the i7.
2) Front interior width: i7 at 1580mm is 10mm wider than EQS (1570mm) and 30mm narrower than S-class (1610mm)
3) Rear interior width: i7 at 1540mm is 40mm wider than EQS (1500mm) and 30mm narrower than S-class (1570mm)
4) Rear interior height: i7 at 940mm is 10mm less than EQS (950mm) and 35mm less than S-class (975mm)
5) Boot space: i7 at 500ltr is 110ltr less than EQS (610ltr) and 50ltr less than S-class (550ltr)
Performance:
0-100km/h - despite most power at 400kw, the i7 at 5.0sec is 0.8sec slower than EQS580 (4.2sec) and 0.1sec slower than the 80kw less powerful S500 (4.9sec).
0-160km/h - i7 at 10.4sec is 0.8sec slower than the EQS580 (9.6sec) and 0.9sec faster than the S500 (11.3sec)
Slalom - i7 at 64.5km/h is 0.8km/h slower than the EQS580 (65.3km/h) and 1km/h slower than the S500 (65.5km/h)
Evasive test - i7 at 131.6km/h is 3.6km/h slower than the EQS580 (135.2km/h) and 2.2km/h slower than the S500 (133.8km/h)
Braking from 100km/h: i7 at 35.0m is 1.5m longer than the EQS580 (33.5m) and 1.6m longer than the S500 (33.4m)
Noise levels at 100km/h: i7 at 61db (A) is 1db (A) quieter than the EQS (62db) and 1db louder than the S500 (60db)
Noise levels at 180km/h: i7 at 70db (A) is 2db (A) quieter than the EQS (72db) and 1db quieter than the S500 (71db)
Electric consumption and range: i7 at 35.3 kwh/100km uses 6.3kwh/100km (21.7%) more than the EQS580 (29.0kwh/100km) and i7 has range of 317km vs 417km for EQS580.