It is just guessing, but wondering if the much lower resolution of the browser on iPhone is not the cause? If you check the viewports: http://viewportsizes.com/?filter=iphone or look at the resolution of the mobile breakpoint, with a resolution of 320 (width) you can never have the same quality as on a tablet (or of course a desktop)? It is not the real resolution of the phone, but the browser resolution that counts.
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