As you'll know if you've been following the phone's launch, the HTC One sports a 4-megapixel 'Ultrapixel' camera, with larger (2 micron) pixels on the sensor itself and f/2.0 aperture, not to mention optical image stabilization. On the iPhone 5, Apple takes a more traditional approach, with a large-ish 8-megapixel sensor, supported by a fancy sapphire crystal lens and f/2.4 aperture. So the iPhone wins on megapixels alone, but the HTC One would seem better equipped for low-light photography.
Here's what iMore's Ally Kazmucha had to say after putting both phones' cameras to the test in a variety of conditions --
Both cameras produced stellar images, yet excelled in different areas. The iPhone 5 does much better when it comes to handling color depth, tone, and saturation. The HTC One leaves the iPhone in the (noisy, noisy) dust when it comes to capturing low light, relatively stationary images.
Apple has been focusing on the iPhone camera for years now, and it's really paid off when it comes to everyday photography. Competitors like HTC, however, are really nailing areas like low light. Hopefully Apple follows their lead, and the lead of Nokia, and starts adding features like optical image stabilization (OIS) and f/2.0 apertures or wider.
For the full article, complete with a few dozen comparison shots, check out the full article over on iMore.