Actually, there are quite a lot of discrepancies in this review.
For starters, the "CPU performance" page only contains JS benchmarks and not a single native application. And iOS and Android use entirely different JS engines, so this is literally a case of comparing apples to oranges.
Native benchmarks don't compare the new apple chip to "old 32 bit v7 chips" - it only compares the new apple chip to the old ones, and also compares the new chip in 32bit and 64 bit mode. Oddly enough, the geekbench at engadget shows tegra 4 actually being faster.
Then, there is the inclusion of hardware implementation in charts that are supposed to show the benefits of 64bit execution mode, but in reality the encryption workloads are handled in a fundamentally different way in the two modes, in software in 32bit mode and implemented in hardware in 64bit mode. This turns the integer performance chart from a mixed bad into one falsely advertising performance gains attributed to 64bit execution and not to the hardware implementations as it should. The FP chart also shows no miracles, wider SIMD units result in almost 2x the score in few tests, nothing much in the rest.
All in all, I'd say this is a very cleverly compiled review, cunningly deceitful to show the new apple chip in a much better light than it is in reality. No surprises, considering this is AT, it would be more unexpected to see an unbiased review.
I guess we will have to wait a bit more until mass availability for unbiased reviews, considering all those "featured" reviews usually come with careful guidelines by the manufacturer that need to be followed to create an unrealistically good presentation of the product. That is the price you have to pay to get the new goodies first - play by the rules of a greedy and exploitative industry. Corporate "honesty"
I don't say the new chip is bad, I just say it is deliberately presented unrealistically good. Krait has expanded the SIMD units to 128 bit as well, so we should see similar performance even without the move to a 64bit ecosystem. Last but not least, 64bit code bloats the memory footprint of applications because of pointers being twice as big, and while those limited memory footprint synthetic benches play well with the single gigabyte of ram on this device, I expect an actual performance demanding real world application will be bottlenecked by the ram capacity. All in all, the decision to go for 64 bit architecture is mostly a PR stunt, surely, 64bit is the future, but in the case of this product, and considering its limited ram capacity, it doesn't really make all that sense, but is something that will no doubt keep up the spirit of apple fanboys, and make up for their declining sales while they bring out the iphone 6, which will close all those deliberately left gaping holes in the 5s