Summary: Think about a Nokia Lumia and the first thing that comes to mind is a `Windows' Phone, lack of apps and no popularity. Let me bust this myth for you. As a user of the brilliant Nokia Lumia 620, I will say that this phone is an absolute gem. I have been using this phone for over 4 months now and will rate its performance and value for money above both its android and Apple counterparts.
Summary: The screen is good, very good . The first impression was very positive given how well you read the screen in bright sunlight . Bring a light sensor that changes the brightness according to ambient light . Thus, for example, the GPS changes colors from day to night every time you enter a tunnel. It is also very nice touch response of the screen , which is quite sensitive.