The g3 is laggy and over heats.
Sent from sent from imh using autobot using GAGT
Laggy because you didn't access hidden phone menu to unlock the cores. To conserve battery, by default G3 only uses 2 of 4 cores. Go google "LG G3 lag" and you will learn how to resolve the lag issue. Of course, lag can also be caused by heavy multi-tasking, loading too many apps simultaneously or enabling screen animations.
No, G3 is better than Z2 because:
1) It has a bigger, sharper screen with much smaller bezels;
2) It has a superior camera;
3) It has louder speaker and call reception;
4) It has removable battery to replace/upgrade to extend battery life