Samsung Galaxy S7 will feature a two diffrent versions, each with its own chipset - one with Exynos 8890 and another one with Snapdragon 820.
Today we saw a performance test of S820 chipset. The said chipset loses a multi-core pefromance fight, but wins the single-core battle with Exynos (2,282 for S820; 1,873 for Exynos). The final scores might change. So right now the new Exynos is ahead of Snapdragon 820.
The Galaxy S7 launch is prepared for March 11.