What you are seeing is a combination of compression artifacts due to shooting in JPG, the camera is slightly out of focus (use AF but make sure you pick a focus point before triggering the shutter), and you probably left it in full Auto which explains the non-native ISO setting of 118. I also tend to stick to F7.1 or higher when shooting full manual even though I know it makes very little difference with such a wide angle lens. This picture was shot at a wide open aperture of 2.8 which means the focus has to be perfect to make the entire scene tack sharp, but a shutter speed of 1/120 which means you would probably have been safe pushing the aperture to 3.5 or higher without having to worry about the effects of camera shake. The buildings at the edges of the scene are slightly blurry (roof lines, windows, etc), a central focus point with your aperture set higher than 2.8 would have pulled those into the scene.
Morgan, try lowering your ISO...... 100 or 200