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EDIT:
It seems I am jumping around a bit, I meant to analyze the ultra settings for 2560x1440, but instead the following analysis is for high settings.
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This set of benchmarks include the beta results, but I will just focus on the official release results for Win 7 and Win 8. Again, the main focus will be on the i5-4670k and the FX-8350. I will state ahead of time that the FX-8350 gets outperformed by the FX-6300, and somewhat outperformed by the FX-4300.
When paired up with a GTX 770 @ 2560x1440 on high settings and Win 7, the Intel i5-4670k manages 81 max FPS versus only 72 max FPS by the FX-8350. Intel leads again in average FPS scoring 73 FPS vs. only 62 FPS for AMD. The story remains the same for minimum FPS but with an even larger performance gap of 65 for Intel and only 49 for AMD. Might as well save a few bucks more and buy the FX-6300 for better performance than the FX-8350.
Under Win 8 both Intel and AMD CPUs perform better overall; clearly Win 8 provides better gaming performance than Win; at least for Battlefield 4. While the dual core i3-4340 performance pretty well in Win 7, it benefits the most in Win 8 when paired with the GTX 770 scoring the 2nd highest max FPS rate of 83. This clearly shows that a dual core CPU with HT is still a contender in multiplayer games.Both the i5-4670k and FX-8350 gains some performance. Intel still wins, but AMD gained 9 FPS for minimum FPS vs. "only" gains 7 for minimum FPS. The FX-4300 loses a bit of max FPS, but minimum and average FPS went up a bit so... overall better performance for the FX-4300.
Let's look that results for the Radeon HD 7970 instead of the GTX 770 in Win 7. This is interesting... all the CPUs lost some performance with the Radeon HD 7970, the exception is the i5-4670k which gained 4 max FPS, and gain 1 FPS for both average and minimum FPS. The "lowly dual core". The FX-8350 lost some performance; a pretty steep drop of 11 on max FPS, with a 2 FPS drop in average FPS and just 1 FPS drop for minimum. The FX-6300 still outperforms the FX-8350. Looking at the Win 8 side of the benchmarks, again all the CPUs gains some performance, with the exception of the dual core i3-4340 which is the only looser of the bunch. The i7-4770k max FPS surged forward by 15, average FPS by 13 and min FPS by a "mere" 11. The i5-4670k performs about the same compared to Win 7 gaining only 1 max FPS. The FX-8350 gets a much needed performance gain, but still lags behind i5-4670k. The FX-6300 still manages to beat it's bigger brother.
If the quoted title "...FX cpus better than all i5s and i7s" actually means that the FX CPU get lower performance than the i5 / i7 CPUs, then perhaps my command of the English language is as good as I thought it was.
Maybe I am reading the performance charts wrong... I thought higher FPS is better than lower FPS... Perhaps after drinking a bottle of scotch my thought process will become much clearer...