First some assumptions:
1 These screen comparisons are real
2 SE had to trim things to fit within the 3 disk limit 'imposed' by MS
3 SE tried to make the game versions as close as possible between platforms
with those in mind, it seems SE have shot themselves pretty close to their groinal regions with this, but have probably missed their danglies by a few fractions of an inch.
X360 gamers in the know (with all honesty, any gamers outside of the internet forums are probably not going to care one iota about any difference) will feel they've got a gimped version.
PS3 gamers in the know will feel their version is also gimped due to their feelings of "what could have been" had SE focussed on the single platform.
This just leads to bad tastes in the mouths of those that care and SE are just lucky that FF is such a strong franchise that it will still go on to sell millions on both platforms. I feel any lesser franchise might not last much longer after having this done to it. Having the potential to alienate many of their core fans is not a good bullet point to put at the back of the game box.
Disclaimer: IMO
Proud Sony Rear Admiral
Essay Pro