I love the 16-80 lens. Its a super versatile range, has great build quality, weather sealing, great OIS, is reasonably compact, and has constant aperture. I have primes at 18f1.4, 23f2, 33f1.4, 50f2 and yes, I would agree that ultimate image quality on those prime lenses are better. If that wasn't the case, prime lenses would be pretty pointless. For outdoor, landscape shots in good light, when I'm not sure what focal length I'll need next, its hard to beat the 16-80mm and its my most used lens. Bad light, indoors, go to a f1.4 or f2 lens.