[AT&T Samsung Galaxy S 4 General] Slade8525:
i work in TV/Film, and i loved my S3. Then i got the S4, and i can easily say this is the first and only mobile ive ever had that has replaced so many things.

I used to bring a Nexus 7 around to show client material on with a (close as i could calibrate) sRGB profile set up and also e-reader.

-S4 replaced it with 97% accurate sRGB in Movie mode. I dont care for the oversaturated screens on most phones; the option to use sRGB is great

-S4 screen is WAY sharper (i have crazy good vision) and higher res is less straining on my eyes.

-I typically shoot 1080P; i can now show 1080P, and even enlarge areas of interest on the fly. My $3,000 Marshalls cant do that without lots of button presses between playback device and monitor.

-I can see the individual pixels easily on the S3, almost at arms length, same with most PenTile displays (RGB always look cleaner as they do not share subpixels). S4 i have to look, and hold it 8-10 inches away.

I use remotes all the time; field monitor remotes (portable screens for filming), tv remotes, pc remotes, Blu Ray remotes, camera release remotes, audio equipment remotes, you name it.

-S4 replaced all of them; i literally put 13 different remotes in a box and into the attic they went; no more needing to charge batteries or chase the right remote down.

-My couch, table, and recliner pockets stay clean and empty

With the Atrix 4G and S3, volume always seemed low and i never got the volume hacks to work, or it was never loud enough with headphone cable to AUX-IN or speakerphone.

-S4 volume hack works great, no SQ loss, and its LOUD; loud enough to drive my HDJ-2000's or Senn HD 25-II's properly, and they sound AMAZING on it; no crackling like the GS3.

-Audio quality is important to me; the low volume and crackling on the GS3 annoyed the hell out of me; i bought (now sold) a portable headphone amp because of it.

If i have a camera with me, its a DSLR, and that means a whole bag of other gear. The Atrix 4G had a HORRIBLE camera; grainy, white balance was ALWAYS off, focus was pretty bad, etc. It reminded me of old 8mm footage shot by an amateur, even in fantastic lighting.

-The S3 has a great camera, but the S4 is sharper and AF is quicker, and the video mode is pretty damn decent as well; mic does a decent job of cutting out handling noise. Granted its nothing compared to even a little DSLR rig with a phantom power amp and a hypercardioid or shotgun mic, let alone most the gear i work on, but its almost as good as cheap camcorders. When i least expect it, ie in normal situations where im not dragging a ton of gear with me, it does the job pretty decently. I am typically a control freak; i shoot and record everything manually; this phone does a good enough job i resist the urge to override it, and i find myself using it a lot more than i thought.

I dont use a lot of the Samsung stuff (my GF does however). SmartStay is always on, and on flights i do actually use SmartPause. I like the extra sensors, just because they are there, i check humidity, pressure, and temperature. And multiwindow i also use, which i thought i never would as the screen seemed too small. Turns out listening to youtube videos while browsing or messaging (without the youtube feature pausing) and the youtube app mostly minimized is awesome.

Those are my reasons. I also really liked the HTC One, but i usually carry MicroSD cards with tons of stuff on them when i travel, and i like having the option of getting a bigger battery.