I love the Sharp X68000 version because it is arcade-exact in every way ^__^
No. It's very close, but "exact in every way" is pushing it. X68k ports have (virtually) identical graphics to their arcade originals due to the resolution and color palette, but the hardware is still not identical to the original arcade boards, and the games still need to be reprogrammed. In the case of SF2, the X68k's single ADPCM channel is also a bit insufficient to handle both the music and SFX. (Of course, this is not an issue with MIDI support. But if you use MIDI, the music sounds less like the arcade original than the FM synth - though it may sound better depending on your preference.)
I do agree, though, that the X68k version is a very close port, and probably the best one in existence at the time.... IF you have one one of the faster X68k models and hard drive.