Power plants can capture 60% of the heat energy. http://needtoknow.nas.edu/energy/energy-sources/fossil-fuels...
Conventional cars capture 12-30% of the energy in the fuel. https://www.fueleconomy.gov/feg/evtech.shtml#:~:text=Energy%....
The difference is big enough that the analysis is easy.
Still at least twice as effective as ICEs.
However, a 2-tons electric car compared to a 800kg ICE? without taking into consideration the wear on infrastructure and on singular parts of the vehicle, i still think you are in comparable zone.
The most important point, IMO, is that localized emissions do the most harm. Even if the emissions were equal, keeping pollution out of the urban core will literally prevent (or defer) millions of cases of lung cancer etc. This paper quantifies the social cost of atmospheric release: https://link.springer.com/article/10.1007/s10584-015-1343-0
ICEs also emit lots of other pollution in the middle of cities, including noise pollution. Electrics would cut down on those or emit them around the factory instead of downtown.