There was once a time when you had to carry a camera as well as your mobile if you wanted to take a decent photo. Thankfully, those dark days are behind us, and these smartphones will be sure to deliver great shots every time.
Not necessarily. Just because a camera has loads of megapixels, it doesn't mean it's the best. There are a lot of elements to take into consideration when looking at camera specs including ISO, shutter speed and aperture, but more megapixels do contribute to better quality photos.
Yes, but it helps if you launch the camera beforehand. The Sony Xperia models all have dedicated shutter buttons on them, because using the touchscreen underwater can be a bit tricky.
In a nutshell, 4K refers to the quality of a display's resolution. Full HD for example (sometimes referred to as 1080p), has a resolution of 1920 x 1080, which is the resolution that we can watch YouTube videos on most high-end smartphones. 4K resolution on the other hand is 4096 x 2160. It's worth noting that some smartphones may be able to shoot in 4K, but as the screen resolution hasn't advanced as quickly as the cameras, you won't be able to watch it back in 4K quality. You will however be able to link it to a 4K TV.