There are a large number of HTC One X (Tegra3) and One S (S4) reviews hitting the net today. I have yet to find anything I would consider the definitive review (Anandtech has yet to publish anything), but the general consensus seems to be that both handsets absolutely scream in terms of real world performance. The benchmarks are comparable but since the hardware isnt the same (screen resolution, RAM), it is tough to get really good comparisons of the chips. The S4 handset seems to have better overall battery life but the One X seems to be at least as good as most previous dual-core handsets...and again, there are differences in the hardware (AMOLED vs. LCD, battery size).
We'll be able to get a better direct comparison on the performance of the chips when the AT&T One X with the S4 processor comes out. Rumors are for an early May launch.