u could see th difference, which, even tho what rubah wrote, I wouldn't qualify as huge, between ff8 and 9's FMVs, and x's, but it was only one of th first games on th ps2... if u think of th difference between ff7 and 9, then u we could assume that by ff13 (if there's any kind of pattern, which there seems to b anyway: every 4th ff is developped for a better console, main series only), square'll hav exploited th full graphical potential of th ps2...

I don't know how to classify ffxi, coz it's so different than th others, but if we count it as "main series", then we'd get max potential with ffxii... but that just seems too near...