Good news for the users those who have been waiting PDF/X-4 support as QuarkXPress 2015 will be featuring the PDF/X-4 support!
QuarkXPress 2015 will allow users to create PDF/X-4 files. The exported PDF/X-4 files are certified with the same technology used inside Adobe Acrobat. With this latest standard, designers can preserve transparency to enable faster output, smaller files and higher quality print output.
Please follow the link below for more information: