@anirban if u want expandable ISO ranges, exposure compensation, etc.. then u can definitely use P mode in PASM....other auto modes r very simple just like P&S
ILC = interchangable lens camera = m4/3, nikon 1,4/3, APSC DSLR, full frame DSLR,Sony Nex,Samsung NX, fuji X series
(dont know sigma and canon's small sensor series name)