Still, that's no clear advantage for me. It's your preference. I like it the way it is.
For you, maybe. For a LOT of customers, it definitely is. I've authored the full sensor oversampler JB tweak for the iPhone 4 / 4S / 5 and they were popular among the JB crowd, despite their framerate-related problems (see for example
https://forums.macrumors.com/threads/1538193/ ). Simply because
people wanted much wider FoV's than the rather narrow ~40mm equiv when shooting 1080p.
Also, there's a reason a lot of manufacturers emphasize their phones have WA lens. (As I've explained in one of my prev. post above.)
Because you could just blow up a 1080p image and add a bit of grain to get the same level of details. It's really hard to produce 4k videos that don't look messy. Even DSLR camera manufacturers are struggling with that. 4k are more than 8 megapixels per frame and even still photographs by smart phone cameras in bright sunshine don't really get you 8 megapixels of detail. The optics just can't handle that.
Wrong. The optics of the iPhone 4S / 5 or the GS4 can easily resolve 8 Mpixels. With a semi-decent optics, it's not the optics that is the main bottleneck with 4K recording but the general throughput and H.264 encoding capacity of the system. When the latter are OK, 4K streams can indeed have vastly better resolution than 1080p.
Again, there is a difference between resolution and level of detail. You don't need to record 1920x1080 pixels if the image is all blurry and grainy.
Let me point out again that, as has also been proved by my resolution measurements (see my latest ones at
https://forums.macrumors.com/threads/1601763/ WRT lossless zooming in iOS7), flagship smartphones can easily resolve 1080p in the stored footage. If you don't believe me, check out my past articles, I've published many on all iPhone models starting with the 4 (and also the iPad 2/3) where I did measure the true, effective resolution of the video recordings of these phones. I certainly know what I'm speaking about.
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I love my iphone (and its camera) but not even close. Have you ever used a DSLR?
Apparently not. Otherwise, he could have spotted the oversharpening halos and the visible noise in all color channels evident in all Apple's shots.
They aren't as bad as with the Sony "Honami" Z1 but still not DSLR level.