Summary: I go out of my way to use this lens. The 1.4 aperture is a lot of fun and gets great shots with beautiful bokeh. I've shot a couple weddings and this lens is indispensable in low light settings. I haven't really had any problems with focus or aberration. I'll switch to this lens from my zoom and run around to compensate because the quality of pictures I get is so superior in color, sharpness, and versatility compared to my other lenses.