The iPhone 5s and the HTC One M8 arguably have two of the best smartphone cameras on the market. Sure the iPhone is 6 months old and the HTC One is brand new, but until Apple releases an iPhone 6, these are devices we have to choose from right now. The HTC One M8 tosses conventional megapixels aside in favor of UltraPixels, which is a fancy way of saying they suck in a lot of light. The iPhone 5s' iSight camera has smaller pixels, but twice as many. Even though both of them look great on paper, how they perform in the real world is what really matters. That's why we're putting the iPhone 5s and HTC One M8 head-to-head, camera-to-camera, in a full-on, in depth, photography shootout. So, which smartphone camera reigns supreme?