Sony has updated its WALKMAN application to build 8.1.A.0.3 which improves upon the previous version (8.0.A.0.4) in a number of areas including improved download speed for offline Music Unlimited content, one-touch transfer of Music Unlimited content as well as easier access to options for each song, album, artist and playlist. The update should be available for the Xperia Z series right now through the Update Centre.
Thanks Georage and all others that sent this in!