Ultra pixel, the next trend of mega pixel. Have you ever heard of this? It's just another meaning less term used for marketing of their HTC product. HTC really wants you to know that its megapixels are BIGGER than the megapixels on competing cameras. That's why they're so ULTRA. Fewer pixels on an identical surface area means the pixels are bigger. Both the HTC One and Lumia 920 have a 1/3-inch sensor, but the 920 has 8.7-megapixels compared to the HTC One's 4MP. That's why the HTC One has larger 2-micrometers pixels whereas the 920 only has 1.4-micrometer pixels.