According to me Lumia 1520 is the best smartphone for mobile gaming. games run very smooth with out any problems.
Lumia 1520 have Snapdragon 800 CPU which very much similar to Samsung Galaxy S5 Adreno 330 GPU.
Cam quality is awesome, i’m using this mobile mostly for gaming and that experience is very good. Upgrade the Operating System to Windows 8.1 and that is cool, so many new features and all.
Note - People who are thinking android is best and lots of applications are available compare to windows. That’s true but windows also have good games and use full apps!
for quality I will always chose Windows phone.
Overall satisfied with the product and with it’s features:)