Do CMIP5 simulations of Indian summer monsoon rainfall differ from those of CMIP3?

To understand the improvements in the simulations of Indian summer monsoon rainfall (ISMR) by Coupled Model Intercomparison Project 5 (CMIP5) over CMIP3, a comparative study is performed with the original and statistically downscaled outputs of five General Circulation Models (GCMs). We observe that multi-model average of original CMIP5 simulations do not show visible improvements in bias, over CMIP3. We also observe that CMIP5 original simulations have more multi-model uncertainty than those of CMIP3. The statistically downscaled simulations show similar results in terms of bias; however, the uncertainty in CMIP5 downscaled rainfall projections is lower than that of CMIP3