I've seen the sample images taken by phonearena.com and was really shocked how sharp the images are. Some people here have suggested that the camera applies strong sharpening. I took a close look at this image and enlarges it to view it at 100% scale. The images is tack sharp. Just look at the screws and the stone texture, it's amazing how sharp it is. The texture quality is amazing. I've seen some jaggies in the street sign that say "Carrer D'Hercegovina" but this is a pixel-wide sharpening if at all.
The sky area is less impressive and quite noisy. I did inspect the exif data, but but it was removed from some reason from the image. I believe that that image with the street sign was shot in base ISO (ISO50), so it's quite disappointing to see a lot of noise in plane color areas like the sky. I wish I knew what optics the LG G6 rear camera uses, but one thing for sure, the Sony IMX258 even with its 1.12-micron pixel, does an amazing job when it comes to image details and texture quality.