All the pictures were taken at aperture priority mode, ISO 50, sharpness, contrast and saturation set to zero (default). I used a tripod and 2s self-timer to keep hand shake from distorting the pictures.
First, the lens at its widest setting 7.9mm (38mm equivalent):
Second, at 23.7mm (114mm equivalent):
Zooming in 3x on the above without interpolation:
The smaller aperture is the sharper one. The downside is that the exposure time doubles. The tradeoff - less sharpness for a faster shutter time - makes sense if you're shooting handheld (which p/s cameras are built for), but not when you are using a tripod (which nobody really expects you to do with a p/s).