The image quality is world class. Needs a bit of light to get the best results, but, any well lit scene works brilliantly. If you are concerned about needed to use higher ISO with this lens, try out DxO Photolab 4 and Deep PRIME noise reduction. sorts out noise and keeps details.
This is a great portrait lens, but, the very fast focus also makes is a great car photography lens. It is like having a built in ND filter letting you get slower shutter speeds for those motion blur shots while still having the aperture open and that signature STF soft bokeh.