The image rendering engine of IE 8,9, 10, 11 is always awful since years of in compare to ALL other browsers.
Example: If you have responsive Design you upload images at the highest resolution (1024x768) and the Browser scale this image as needed.
ALL browsers deliver scaled and sharp images except the IE 8,9, 10, 11 (IE 7 use-ms-interpolation-mode:bicubic) which no longer work.
Compare it with the frontpage of www.microsoft.com - scale it to Smartphone Size and see the images: IE 8,9, 10, 11 always has NO anti-aliasing.
PLEASE FIX THIS - or people using IE must accept this...?!