Qualcomm Snapdragon 820 Advantages
Better graphics card performance FLOPS (0.3194 TFLOPS vs 0.1536 TFLOPS )
Larger memory bandwidth (29.8GB/s vs 14.9GB/s)
Higher Frequency (2150MHz vs 1800MHz)
More modern manufacturing process (14nm vs 28nm)
Released 9 months late
Qualcomm Snapdragon 652 Advantages
Lower TDP (7W vs 11W)