Below are some examples of high-resolution and standard-resolution images so you can compare their quality side-by-side. Images with a green border are the high-resolution, and images with the red border are the standard-resolution. The image browser widths are set at 320 pixels. If both images have a red border then you're not viewing them on a hi-res display (or your network connection is slow).
The high-resolution image widths will be 320 pixels multiplied by the scale factor, so a device with a pixel resolution of 2 would request an image width of 640 pixels. However, a standard monitor with a pixel ratio of 1 or a device with a slow connection would still only request an image that's 320 pixels wide.
Photo by Honza Groh
Photo by Kallerna
Photo by Joi Ito
Photo by Softeis
Photo by Roger McLassus
Photo by Lance Corporal Samantha L. Jones, USMC
Born to the West (Paramount Pictures)