Of the images shown, none is really what I would call "truly sharp" ... and the colors are off a bit in a few as well.
Don't get me wrong, with a casual look, they're all nice images ... thanks to the subject + timing of the photographer ... however, if really scrutinized, no part of any image I would call either truly sharp or beautifully-rendered ... and some of the skin tones and other colors don't seem as true as other AI-S lenses here have put out.
If you look at the lens itself, it's an el-cheapo construction, so when you put these characteristics together, this (imho) is probably why the lens isn't over-loved compared to other options.
The 35-70mm f/3.5 AI-S is a better choice at that range ...