Yes, there appears to be a discrepancy in the graphics for the PS3 and Xbox 360 version of Bayonetta. SEGA wants to be very clear, it did the PS3 port.
Platinum Games has pointed this out in the past — even going as far to state its own role in the process.
But SEGA is going the extra mile, just to make sure everyone is on the same page. For example, Bayonetta's PS3 demo has this placard that reads, "Converted by SEGA". If that wasn't even, games PR game mag Famitsu even points out that SEGA ported the PS3 version.
Racking my brains to another example of a company using "Converted by WHOMEVER" in the end credits in a game demo.... Wonder what the big deal is as it's not like the PS3 version's controls are totally wonk. The PS3 version is just fine! Try out the demo on the Japanese PSN and decide for yourself.