#5 is likely the FT independent analysis here, which found math errors, cherry-picking of data (to meet manufactured-in-advance conclusions), etc.: http://www.ft.com/cms/s/2/e1f343ca-e281-11e3-89fd-00144feabd...

Though over at MR, they noted there "were already several major problems" with Piketty even before the FT debunking, including that if you adjust for the housing bubble a few years ago, his results disappear: http://marginalrevolution.com/marginalrevolution/2014/05/wha...