Um, what does aluminum have to do with build quality?
It has to do with materials VS. application. You don't see many plastic cars do you? Saturn tried it and they went out of business because no one wanted one. There are many high strength plastics available today but what material do you think most cars chassis are made out of? I'll give you a clue, it's NOT plastic. And what about computers? Ask yourself why did Apple spend millions of dollars researching materials, and then decided upon using aluminum for their new Macbook Pros? For electronics there are so many advantages of this material over cheap plastic. And speaking of advantages, see many plastic heat-sinks? Didn't think so. There's a reason for that. Plastic and heat don't get along very well. There's also the social interpretations of the materials. Most people associate plastic with toys, and aluminum with higher-end products because it's generally felt to be more elegant. Aluminum is also a more "green" material as plastic is made with petroleum. Aluminum also is more efficient to recycle than plastic. Once the aluminum has been produced, it can be recycled over and over again.
When you use the term 'build quality' it can mean many things. Design is also a big part of build quality. So is longevity. Aluminum will out do plastic every time in the longevity department. If you were a manufacture and your concern was making more profit, then plastic would be what you prefer. If, however, you wanted to portray that your product was classy and
elegant, then you'd do as Apple has and choose aluminum. The final nail in the coffin for those samslum plastic lovers is that samsung has themselves decided to move AWAY from plastic, and the next S5 will be similar to the HTC One and use Aluminum. The s4 fanboys have no answer for that one.
once they saw mine set as Standard or Movie Display with the perfect Brightness combination
Having a better display is one reason I got
rid of my s4 and switched to the HTC One. If you know someone who thinks the s4 looks better - then they don't need a smartphone, they need an
ophthalmologist. Can the s4 even display true white? Not really. The word "better" is usually subjective, BUT when it comes to displays there is NO DOUBT that the HTC One smokes the s4 and is much superior. Read 'em and weep;
Guess you won't be showing THAT video to your friends at work. LOL
Marketing departments must love you

MP are meaningless these days. The majority of camera comparisons between these two phones show that the HTC one takes better pictures. For most people, that's what's really important, the end result, but by all means you enjoy your mega pixels. LOL
The bottom line of S4 VS. HTC One.... Samsung spends
LOTS more money in marketing. Some people fall for that marketing. I'm happy for them, but when they try to push their 'junk science' it simply can't hold water.