The benchmarks were lightly threaded, for which Xeons basically offer no advantage - they let you have more cores in a machine, and that's about all. For rendering and encoding, the 12 core 2010 Mac Pros would still slaughter a retina MBP. No competition.

There are many impressive things about the retina MBP, but CPU performance is not one of them.

I would say the CPU performance is very impressive, sure a 12 core will beat it at rendering, but the single threaded performance is amazing, and the super fast SSD makes it basically the fastest Mac ever in general usage.