Shinkansen E5 is about 1.1 times as fast as Shinkansen N700S (lead car).

Shinkansen E5 and Shinkansen N700S (lead car): data

NameHeightLengthSpeedWeightArea
Shinkansen E5——320km/h
max. operating speed
——
Shinkansen N700S (lead car)3.6m
max. height
27.35m300km/h
Sanyo section; 285 km/h on the Tokaido section
——

Sources

Shinkansen E5 is about 1.1 times as fast as Shinkansen N700S (lead car).