I dunno about that. I remember that review for the XFX. He gave it a very low score in performance because while it put up outstanding numbers all across the board, it failed the crossload test which by his own admission, he ran out of spec. And in any case this is something that 99.9 percent of users will never run across. In this price range there is no perfect unit, compromises have to be made, and I consider that to be an acceptable one. He also took points off for aesthetics, because he didn't like how it looked, which is obviously completely subjective. The corsair unit on the other hand has good specs but crappy build quality. In his review, he noted that some of the 5 volt wires didn't work at all, (but for some reason I don't remember, didn't take points off. How a unit can not have points taken off when it doesn't even work out of the box is beyond me).
In any case, as I said, I would definitely take the XFX over the corsair because:
It has better specs, with the one crossloading exception which no one uses.
Much better build quality.
Anytime I am undecided, I'm going to take a Seasonic unit over a Chanelwell.
Lower price.
Efficiency is a complete non starter; they are so close in efficiency run them both for a year and at the end of the year, you will have payed maybe 2 dollars a year more in electricy. Obviously doesn't justify the substantial increase in cost.