Okay, I'm posting this here because this is where I think this will be most appreciated and I won't be receiving tons hateful comments.
I'm typing this on the S5 and despite only having it in hand for half a day, I can easily say that the HTC One M8 is far superior.
I'll keep this super simple. The S5 is a great device. Lots of features (not all work great but that has to be a plus, right??), a great camea, revamped settings which isn't too bad so when you've covered up TW with a 3rd party launcher it's pretty cool, SD c... Never mind, we know what is has.
So why do I say it's better? It took me a while to figure that out. Personally and this is my opinion, I like the way it looks and the new "bandaid" back is nice to the touch. It feels good in the hand... But I was able to put it down. I had no real desire to comb through all the apps and features. With the M8, I can't put it down. Even now and I got it on launch. Despite the M8 being it's speaker size taller than the S5, I can use it one handed much easier. If I was using the M8 to write this, I'd be doing it one handed. I'm using 2 with the S5. The camera on the M8 is better than the S5 as long you don't have to crop a lot. The interface is SOOOO much better and all the extras you can do to the M8 pics can all be done afterwords without selecting a feature before the pic is taken. On the S5, you have to select the type of mode, take the pic, then edit it. And the results were VERY hit and miss. But I digress, the bottom line is the S5 has been done. It's called the S4 active.
I can't tell you exactly what the M8 has that keeps it in my hand... Build? Sound? Sure, but it's more than that. It's the things that we don't think about. It's the things that I don't realize I want and don't know what they are. All I can tell you is, the M8 belongs in my hand. I pick it up, double tap the screen, swipe and just stare, trying to think of what I want to do next. I've no desire to do that with the S5.
Okay, I didn't keep that very simple.