[Galaxy S 4 General] BarryH_GEG:
I was on a long conference call and did some camera research. Mostly because I was clueless about Zoe and, as the go-to-geek for my friends, I know I’ll be asked about it.

Here’s what’s the same on both devices even though the approaches may be a bit different:

Shoot a still while recording video

Continuous shooting (standard without additional s/w support)

Skin smoothing (One: Scene >Portrait/SGS4: Mode>Beauty Face)

Panorama

HDR

Slow motion video

Action Sequence Shot (One: Zoe mode/SGS4: Mode>Drama)

Pick the best “faces” from a sequence of group shots (One: Best Features/SGS4: Best Face)

Best pic in a sequence (One: Best Shot/SGS4: Best Photo)

Smile/face detection

Eliminate unwanted objects (One: Object removal (manual) from a Zoe/SGS4: Mode>Eraser [automatic])

Night mode (automatic available on the SGS4)

Slow motion video

Size videos for MMS sharing (One: resized when “shared”/SGS4: Mode>Limit for MMS)

Here’s what unique on the SGS4:

Still camera:

Sound and Shot – Imbed voice clips with photos

Animated Photo – Create short GIFs (Vine) from a longer video

Sports – Better capture fast moving subjects

Video camera:

Fast Motion

Both cameras:

Dual Camera – Capture from both front and rear cameras at the same time

Remote Viewfinder – Use the phone as a view finder to control another Galaxy device connected via Wi-Fi Direct or NFC tap

Here’s what’s unique on the One:

Zoe. Here’s HTC’s description: “Record memories as a "living album" of up to 20 photos and a 3-second video."

Here’s how it’s used: HTC’s predicated a number of what Samsung refers to as “modes” on Zoe being active which means 20 stills and 3 seconds of video are/need to be captured. Meaning you have to take a “Zoe” in order to be able to use those features. They are: Sequence Shot, Always Smile, and Object Removal. You can’t use those features without taking a Zoe which comes with limitations discussed below. Also, when using Zoe, some features aren’t available such as zooming.

To capture a Zoe you: Tap the shutter. When you see the shutter release icon slowly turn red, continue holding the phone steady as the camera captures a few seconds of shots.

Some downsides I see (YMMV): Zoe mode is pretty much useless for spontaneous shots because of the warm up. You lose the One’s low light capabilities when in Zoe mode which is required for certain things like sequence shots, always smile, and object removal. Zoes are cumbersome when used offline.

Here’s what Brian from Anandtech said about using Zoe mode:

The only thing that takes a bit of a hit is low light performance while taking Zoes, partly because video framerate is prioritized and thus HTC can’t run as long exposures. Most of the time this isn’t a big deal until you’re in an extremely dark scene.​

Here’s what Anand said about using Zoes off the device. On the device Zoes are automatically grouped in to “scenes” in the gallery.

The animation in the Gallery is seamless which is more than we can say about it outside the HTC One. If you save the pictures into your PC you're left with 20 shots for every Zoe animation created.​

Here’s what HTC said about the transformation from “Zoe” to MP4 for offline sharing:

For HTC Zoe photos, use HTC Zoe Share to provide your recipients with the total HTC Zoe experience, including a highlight video and a collage of your best photos. Sharing in other ways may not deliver the entire series of shots to the recipient.​

Here’s some post-processing stuff that’s pretty cool that’s not on the SGS4:

Face contour, which allows you to easily slim someone's face. There's also Skin smoothing, an automatic lightning fix, Eye enhancer (which makes your subject's eyes open wider), Eye brightening, Red-eye removal and Anti-shine.

If I got any of this wrong, One owners please speak up and I’ll gladly make corrections.