Depends on which version of OS X you're comparing against. VLC and Mplayer use OpenGL output. QuickTime doesn't necessarily output in GL depending on the OS X version.
It's been the same experience for me on any OS from 10.3 through 10.7 on PowerPC and Intel. Once again you're basing what you say on very vague statements that have nothing to do with real world events. I know what my CPU meter has said on PowerPC and Intel Macs and all those OS's I mention.
My point is that across the board regardless of OS or architecture VLC has been better optimized. CorePlayer is even more optimized than it on both architectures as well.
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