Irrelevent really as the Xeon W5220 in the quad Mac Pro is the same but with ECC support.
Relevant as the i7 is cheaper and offers the same performance in a single CPU configuration.
Marked up $1,250 and in a Mac Pro case? The market just doesn't interest Apple I'm affraid. I doubt it'll change now either.
Fine, make it $1500. You know the video card is only going to be $25 of the cost. :rolleyes
There is a huge gulf between Apple's laptop based consumer machines (mini, iMac, and the laptops) and the Xeon based Mac Pro. There is nothing in that middle area.