The reviewer compared it to Ivy Bridge i5 clock to clock performance or IPC, so if an i5 was downclocked at 1Ghz you would see the same performance in benchmarks without Intel CPU using hyperthreading for fair comparison 4 cores 4 threads vs 4 cores 4 threads.
i7 3770k in total has 14Ghz of raw performance and PlayStation 4 will have 12.8 to 16Ghz depending if its clocked at 1.6 or 2.0Ghz, developers will use all 8 cores and we already saw that FX 8350 beat i5 3570k in Crysis 3 by a considerable margin. Imagine if Steamroller has 30% IPC over Piledriver, it would demolish Ivy Bridge and Haswell in Crysis 3 and soon Crysis 4.
The i5 u's have 2 cores with HT and are still faster then the temasha desktop i7 is an entirely different beast with 4 core w/HT way more cache higher clock speed etc.
The per-ore performance of the temash chip isn't even up to PD (FX-8350) in the PS4 you would get nearly quadruple the CPU performance which isn't tonnes i.e less the a FX-8350 and less then an i7.