Shanghai's GDP per capita was 86,657 yuan in 2013, while Chongqing's GDP per capita was 38,349 yaun in 2013. Tibet's GDP per capita was just 26,068 according to the latest regional tables from NBS.
A quick chart of some poorer regions shows that 1) the gap between poorer provinces and Shanghai is shrinking (convergence!), 2) the speed of convergence is moderate, suggesting that regional inequality will remain high, 3) the relative positions of regions are not changing in recent years.
I plotted all regions earlier (in absolute terms, not relative to Shanghai) here.
Real GDP of the 3 richest regions
Data: NBS. Chart: J. Zilinsky