I wouldn't say it is the worse BUT the 4MP Ultrapixel camera has its limitations since when you zoom in or compare it to the iPhone, S4, or 1020 it lacks detail
For me 4MP isn't a huge problem since most of my pictures went straight to Facebook or Instagram BUT of you plan or printing off photos or looking for a lot of detail the HTC One isn't for you
My bigger problem with the camera is the blue/purple tinge on low light photos or even some well lit situations the camera tends to add blue
Also, in even really well lit situations I was getting shadows or dark spots on photos. I was in the Bahamas and it was sunny and clear the whole time but a lot of photos came out dark and at times you could see the faces. I think this is an example of how the One does well with lower lit situations but in completely lit situations in struggles compared to the iPhone or S4.
The shutter speed is incredibly fast and can capture movement well.
I think the S4 and One have the most features, so if filters and such are your deal these phones will fit you
Overall, It's a very good camera but the iPhone, S4, and defiantly the 1020 are all better.
This leaves me with a point, if you had to create a super phone who would it be and why?