Actually, the HTC One's camera is 4 "ultrapixels". When zooming into a photo you take it might not look as great as the other phones, however, because the sensor is larger, it's capable of taking in more light, making night shots look unbelievable. I took these photos with the HTC One on a rooftop in NYC. It also takes gorgeous videos. Don't let megapixels be a deciding factor on a phone camera. Try pulling these pictures off with an iPhone or the GS4.
Take some time to read the most in-depth review I've ever read for a phone. I highly recommend the HTC One.
http://www.anandtech.com/show/6747/
The Samsung Galaxy S4 is very gimmicky. A lot of unnecessary features that slow the phone down. The HTC One is so smooth, I swear, it's the best phone I've ever used. It's a device that I'm not rushing to upgrade.