It would be nice if we could have the users boot up these new machine's drives on older Macs.Any speculation as to whether or not the lower CPU utilization may be due (at least in part) to Apple using a new version of Quicktime that's SSE4 optimized?
Remember back when just after the Penryn release when a few DivX 6.6 tests were showing some really nice gains for the SSE4 enable processors, such as 200% better encoding times and 40% greater frame-rates vs. previous processors and SSE3? The real-world problem then was the almost total lack of SSE4 optimized apps... but even now, there's still few to be found in either the Windows or Mac worlds.
You have to take the drive out on the Macbook but you still have Target Disk Mode on the MacBook Pro.