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They came out quite close together, and the price difference is confusing.
It's a fair chunk of change to be spending, it's nice to get a sanity check from those in the know.
From the date on the review you have linked to it seems that the tests on the Vertex 4 were run prior to the V1.4RC firmware update that has significantly increased the 128KB read speeds. In some cases the newer Vertex 4's are 110% faster than the older firmware.
Read more here: http://www.techspot.com/news/48486-...te-inbound-doubles-writes-on-128gb-model.html