Here’s my initial review after using it for a week. This phone not just looks good the build quality is excellent, 246 ppi for a 3.8inch screen makes it a lot vibrant, camera quality is decent considering its 5MP, nice loud speakers, windows OS works smoothly making it overall a excellent phone for everyday use.
BUT....few basic features like turning off the screen rotation, select a ringtone from music player is missing & Many official and third party useful apps is still unavailable. From my personal experience ...Do not buy this if you have used android phone before because this might disappoint you in terms of applications availability and ease of access.
But for a person who like to use only general apps like whatsapp, Fb, Twitter, check mails Lumia 620 will be a perfect phone.
My ranking comparisons with an android phone
Nokia handset - 7/10, Windows OS - 5/10
Samsung handset - 5/10, Android OS - 9/10