Concept artists on ArtStation often release "Vanity" renders in 16K to showcase their skill. Search for "Avengers fan art 16K digital painting." These are often superior to movie stills because they are vector-like and scale perfectly.
Marvel occasionally releases true 16K renders for marketing IMAX exhibitions. These are rare and usually watermarked. However, cinephiles often extract 16K frames from the digital IMAX remasters (though file sizes exceed 200MB per image). avengers 16k wallpaper
If you set a 500MB image as your desktop background, Windows Explorer or macOS Finder has to decode that image and keep it in memory. This can cause lag on older systems. To avoid this: Concept artists on ArtStation often release "Vanity" renders
"Avengers Endgame 16K wallpaper" "Avengers 15360x8640 wallpaper" "Avengers AI upscale 16K" avengers 16k wallpaper