Winner: Samsung Galaxy S4. It's pretty clear that things are going in favor of the Galaxy S4 here. It produces sharper photos with better colors and there's resolution to crop things out. The narrower FoV is not ideal but it's not a deal-breaker. The HTC One lost this round, though to be fair it was never expected to win a head-on fight in good lighting conditions. Its photos are certainly good enough (even better after the update) if you'll post them on Facebook or show them off on a TV, but don't come close to the samples produced with its competitor today.
low-light camera performance
Winner: Samsung Galaxy S4. Surprisingly, the Samsung Galaxy S4 has the better low-light camera performance. You'll have to snap several photos to make sure you have a good one, but the end result will be better than what the HTC One produces. The Galaxy S4 has a slight advantage in low-light video too. The HTC One is more reliable - thanks to its OIS you can snap just one photo and know it will be about as good as it gets. But the camera's performance is simply nothing to write home about, and there are cases when OIS just isn't helping at all (when shooting moving subjects).