HTC Evo 3D. Its a few years old, but I'm still happy with it. It is the only 3D camera that I own, so it is difficult for me to compare. Its ok. But I'm not going to be making any Hollywood blockbusters with it.
iPhone 5s. Pictures are not bad (in good light). Video is surprisingly good (although I have only played in back on the phone). Have a Vizsla puppy..... love to film her antics using the 120 FPS 'slo-mo' mode.
Samsung Galaxy Nexus, which is known to have worse camera than Galaxy S4.
Having played with cameras on iPhone 5, 6, 6+, Samsung Galaxy S4, Note3, even LG G3, I think all these cameras serve OK in daylight or great light. They ALL fall down in low light.
Below is sample from Nexus which had such horrid noise that I used NR program in Photoshop as experiment, and it still had bad noise on it.
I'm using an iPhone 5 right now. Previously I had a Samsung Galaxy S (the first one!) and the camera on it was OK, nothing great. The iPhone 5 camera was a huge improvement though over the Samsung and I've gotten some pretty decent looking snapshots from it. I use it as a quick snap camera for unimportant things and for office work related stuff. It's quick and easy.
IPhone 5s. Before that I had the 4s. Both have similar cameras (I cannot tell any MAJOR difference between those).
One of the main reasons I have an iPhone is its camera: iPhones are always top of the line when it comes to photography.
Samsung Galaxy S3. The camera is just this side of entirely useless. After testing it, I keep my Elph 500 HS in the same pocket as the phone. It's a better camera by at least in order of magnitude, if not more.
I'm sent a lot of iPhone pictures for use and processing. In general, they're worse. The iPhone seems to like to shoot at high ISO a lot, but even at base ISO, the noise is absolutely horrible.
Samsung Galaxy Note, v1.
Although not using it regularly: if there is enough light, the result surprised me positive.
Don't happen very often, because I always carry my RX100 with me.
Recently upgraded to the Nexus 5 from a Samsung GSII that had a giant blob of sensor dust. I haven't used the camera much yet, but it did do a stellar job recently of capturing the license plate of a builder's truck that smashed into a parked car on my street and promptly took off. Justice!