Well, obviously, the NES version is far superior to the rest.
Regarding graphics, the CPC is quite nice, Spectrum is not bad, and it's a shame that MSX had a speccy port. C64 is not rally bad, but the color are badly chosen so it appears to be a huge grey block.
For the 8 bit computers, it seems to be a rushed conversion, as besides C64 and NES no other one has music ingame nor decent sound effects.