Yes there will be a speed improvement. The GS3 has 2 different models. The International is a quad core arm cortex a9 chip. The USA version is a dual core Snapdragon S4, a modified arm cortex a9 chip. The snapdragon has performance nearly on par with the arm cortex a15. The Exynos 5 chip, will have 4 arm cortex a15 cores at the very least, if not four a15's and four a7's. The four a15's will each be 40-50% faster clock for clock than the gs3's international a15's, and better than the measly 2 cores in the USA GS3. So long as they go with an exynos 5, the gs4 should easily be more powerful.
Also I wouldn't call it a prius. The prius isn't powerful. It is only efficient. The prius is more like those low end a7 only phones, which sip power. The gs4 if it goes octa-core would be more like the tesla model s. Capable of efficiency, but also capable of pure raw power.
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