Okay, wow, major misinformation.
The Rezound has a 45nm dual-core Qualcomm Snapdragon S3 processor (MSM8660).
The US-variant Galaxy S III has a 28nm dual-core Snapdragon
S4 (MSM8960), a chip which is generally considered as good as, if not better, than the quad-core Tegra 3 in general usage. The S4's GPU also has double the clock speed of the S3's.
What that difference actually means is this: the 8960 performs
twice as well as the 8660. Take a look at this, and note where the Rezound is:
As far as the Exynos 4 vs the S4... even that's a bit of a performance tossup. The S4 comes on top in some benchmarks, while the Exynos comes on top in others. Neither is indisputably a better processor, though the Exynos chipset does have a better GPU.