You could plop a full frame lens on a Sony APS-C camera and get great results--after all, the crop sensor eliminates the most troublesome areas of the image. But, it's highly unlikely most will want to put a $2,000 lens on a $800 camera. The Sony E 50mm f/1.8 OSS is an affordable lens that still offers a wide aperture and decent image quality. Image stabilization is also included--which is rather rare on a lens at this focal length and price point. The wide aperture and focal length makes it an excellent option for portraits, but this lens is also good for low-light and street photography. The lens is easily portable, though the image stabilization makes it a bit larger than a lens without that feature.
While the lens scored a respectable 25 on the DxOMark tests, the sharpness is a bit lacking, even towards the center of the frame. Using a narrower aperture helps eliminate that, but negates some of the lens' benefits. The lens' low sharpness score is made up for a bit by minimal distortion and chromatic aberration. In short, this lens is a solid performer, but with a bit of softness at the wider apertures, it doesn't offer the same quality as Sony's pricier lenses.