Please, don't anybody get this question wrong (I truly appreciate the time and effort such comparisons take!):
Why does everybody always do these comparisons with Megadrive and SuperFamicom?
Even in Japan these platforms were released a little over two and three years (!) after the PCE respectively.
And yes, comparisons there go to show how well the PCE was able to stand its ground in its latter days, but until late 1989 there was no alternative to the PCE. (Not that there is these days, 25 years later ...
)
But what is usually neglected, is how extremely the PCE graphically wiped the floor with 8-bit Sega and Nintendo at the beginning, and how it could conquer such a large market share in the first place.
I would love to see more such comparisons with the 8-bit systems mentioned, especially for games published in the first three to four years of the PCE life (fall 1987 till 1990/1991).