I can't tell who you are referring to, but I'm happy to walk you through my math.
1). HyperThreading typically gives Intel CPUs a 20% performance increase, tops.
2). A Core i7-4790K clocked at 4.4GHz runs 2.75x faster than 1.6GHz for Kabini. Kabini, of course, has 6-7 cores devoted to rendering as compared to Intel's 4+4.
3). Haswell's IPC is between 1.4 and 2x faster than Jaguar, clock for clock and core for core. This is partly because Jaguar's slow IMC and half-speed L2 cripples the processor's performance in L2 or memory-heavy code. Whether the consoles use different IMCs is unknown, but they *do* use the same half-speed L2 cache.
Let's run the numbers on that.
Intel has 4.8 cores (4C * 1.2x for HT) * 4.4GHz clock speed * 1.7x IPC = 35.9 Performance Fator.
Jaguar has 7 cores (one reserved for OS) * 1.6GHz clock speed * 1x IPC = 11.2x Performance Factor.
The Core i7-4790K should therefore be ~3.2x faster than the seven-core Jaguar.
Yes, that's just an estimate. But the CPU isn't the bottleneck in this game, at least not with significant levels of MSAA enabled.