Canon EF-S 10-22 not satisfactory performance

Many thanks for your comments. Greatly appreciate all of them!

All of shots were taken in RAW, so I have done some post processing (e.g. changed the exposure, saturation, WB, lens correction). See below. But still, I am not fully satisfied. It might be just that my expectation related to IQ and colors were too high.

Tops of railings are blurred

The building on the left hand side is not sharp

Tree on the left hand side is kind of blurred.

The flashes on the cars are reddish and the top right corner is not sharp