Lumia 540 is the true successor of Lumia 520.I am completely satisfied with the Nokia lumia.
Those who want to try something new rather then android should have ti pick Nokia lumia.
Touch is as good as android phones. It did not hang.
Sound and display is up to the mark. If you are not crazy about junky apps then it is a perfect buy. All the office are preinstalled. Break the prejudice and go for Nokia lumia.