Yea its depend on user choice about whether they prefer super Amoled or lcd/super Lcd / Retina display. AMOLED is good for black or sunlight visibility but white dont look pure white on Amoled display. Amoled also offer more saturation and contrst .Lcd display give more natural colour. I think 720p screen is more than enough for mobiles so these extra pixel just killing battery life.
If you are audiophile then you should root after your warranty expire and try some great sound mods on XdA. I am using this MOD
http://forum.xda-developers.com/crossdevice-dev/sony/mod-dolby-digital-beat-sound-mod-t3117618
Another good thing about z series is that they are quiet cheap compare to others brand even when they are offering more . I got two used z2 phones from ebay in excellent condition ..one was for £130 and second for £150 . I never buy brand new because i always root