The camera app on the Nexus 5 benefits from Google's emphasis on photography which probably has something to do with answering Nokia's focus on the same subject matter; the camera app features a number of filters already on the phone, out of the box. And you can even turn your own favorite combination of settings into a preset that you can ue to quickly have your pictures come out the way you want them...
Source: http://www.phonearena.com/news/Video-shows-off-Android-4.4-photo-editor_id49004
Source: http://www.phonearena.com/news/Video-shows-off-Android-4.4-photo-editor_id49004