Vastly better picture previews, lots of feature improvements. Performance can suffer with lots of high-resolution pictures. For big improvements in version 10, Quark chose to take on graphics display and handling, and a complete rewrite of their code for Mac OS X. Then they tackled a long list of user-requested smaller improvements, and added a few surprises.
Total downloads: The built-in WYSIWYG editor contains very powerful tools to manipulate the graphics and texts sections right from the same interface without the need for 3rd party apps.
QuarkXPress 2019 v15.0 Multilingual