I went into my local store to have a look at a lumia 1520. I found that when I pressed my thumb into the display with what I would describe as a medium amount of pressure. The LCD was warping like when you touch an LCD display on a computer monitor for example. All other lumias to my knowledge have completely rigid displays. If I press my thumb into the screen of my 920 with what I would describe as a lot of pressure, nothing happens. Its solid. Has anybody else found the same?