There a good survey in Tom's Hardware of the various smartphone SoCs from Rockchip, MediaTek, Allwinner and Spreadtrum. There's ones there I didn't know about!
An Introduction to ARM-based Chinese SoCs - Tom's Hardware
Plus they have an older one for Qualcomm, Samsung, Nvidia and Apple
An Introduction to the Major ARM-based SoCs - Tom's Hardware
Very nice article.
Though, I'm a bit disappointed that they do not mention the 2GHz/Quad Core Cortex-A9 from Amlogic...
At least they should mention the S802 and S812. T866 is probably the most interesting MCU.