Live view lets you take photos without using the viewfinder which makes you less obstrusive and this works very well during street photography where you don't want to get people's attention. Face-Detection Focusing
Face detection focusing mode is very helpful in the street scenes where you focus on a face, since you can concentrate on framing and other adjustments while the camera handles the focus for you. Image Stabilization
Image stabilization reduces the effects of camera shake at long exposures and long focal lengths in street photography thus ensuring sharper photos.
Medium sized Body
Mirrorlessbody of Pentax Q-S1 is a good combination of relatively small size and good handling camera, without giving the impression of a professional camera.
No Built-in Viewfinder
In the lack of a a viewfinder, holding the camera away from the body while using live view is not very stable, especially with heavy camera bodies and lenses. Besides, LCD screens are very hard to read under bright sunlight. Small 1/1.7" (7.44 x 5.58 mm) sensor
An articulated screen gives you the flexibility to shoot in non traditional positions such as waist level, which helps you to be more creative and unobtrusive in the streets.