I'd opt for the pair from Saks if you were considering a purchase... I really doubt that the new pair is blake stitched, as it doesn't seem to be substantial enough for that to be the case. Get Smart already stated that though, and he definitely has more experience with PS products than I do judging from his collection!
-Random note. There is an interview with Sir Paul Smith in the current issue of New York magazine. (the one with the nude lindsay lohan pics). The magazine is split on either side between men's and women's spring fashion.