It would look a lot different for sure. Pre-rendered still image environments, and everything text-based. Also the FMVs would have all been terrible quality and ran at 15fps. I think it still would have been a great game though.

I've always wished some dedicated fan out there would remake the game for an SNES emulator in FFVI's engine. Can you imagine how the whole scene of Sin blowing away the crusaders and the al bhed would have been in 16-bit 2D? Glorious.