What's the source of these artbook scans, anyway? I never bothered to look.
Edit: The resolution is higher, but the quality is significantly worse compared to the other upload. You're not upscaling these, are you? Perhaps the original scanner just sucks. This page is a good example. Zoom in on the hair. Whoever scanned this sucks.
@Elemhunter I got the first version of mine from archive, then I found a better sharper version on 13dl. No clue where they got their version. This version is based on the one on archive.org it seems.