The pictures below illustrate the angles of view on 35mm full frame and APS-C camera bodies:
Excellent image quality when stopped down; Essentially no lateral chromatic aberration; Extremely cheap
Extremely cheaply built; Harsh and distracting bokeh due to pentagonal aperture; Vignetting at wide apertures on full frame (which only disappears at F3.5; Inconsistent autofocus in low light (most problematic when using large apertures