did you say that in some of your results the MBP fared better than anticipated? My new MBP Retina has much faster buss speed than my Mac Pro, probably due to the 1600Mhz RAM? who knows, but I am impressed with it so far. I haven't really done any serious editing with it yet though.
In my editing geek circles i was almost surprised at how many friends didn't see the value of the Mac Pro when I was worried about it's fate a year ago. Even though the last refresh was more of the extention of it's life rather than a update in features, I still maintain that a XEON Quad Core is not the same as a i7 Quad Core processor - and how hard is that to figure out when you look at the processing tray on a Mac Pro compared to the thin processor on the portable versions.
Regardless, i admit that the laptops are amazingly fast for laptops! I'm very close to considering not shipping my Mac Pro / SAS RAID setup to Hawai'i next year! I can see that the MBP and a thunderbolt RAID may just be able to turn a big job like the Ironman around (almost) as quickly as my Mac Pro setup... it's getting close.
If the Mac Pro gets a real update, then that all changes though! Can you imagine a Mac Pro with thunderbolt, 1600MHz RAM and 16-cores, (and maybe even USB3)? It would be a very quick machine, for sure.