Hardly a comparison, more of an outline of the key differences between the two Lumia siblings. We’re frequently asked what the differences are between the low-end to mid-range Lumia handsets, so hopefully this brief comparison will shed some light on the main differences between the two..
OS: So as I’m sure many of you are aware, the 620 and the 820 are both running on Windows Phone 8 (as are the whole Lumia series)
Processor: Both handsets are powered by Qualcomm’s Snapdragon S4 chipset but are clocked at different CPU speeds. The 620 is clocked at 1GHz whilst the 820 is clocked at a more efficient 1.5 GHz. The Lumia 620 features an Adreno 225 graphics processor compared to that of the Adreno 305 that is featured on the 820. Naturally the 820 will respond faster in certain situations and will be the favoured handset in this instance.
Display: The Lumia 620 has a 3.8 inch capacitive LCD, ClearBlack display with a resolution of 800×480 pixels (246 ppi pixel density). At 4.3 inches the Lumia 820 features a capacitive AMOLED, ClearBlack display, again with a resolution of 800×480 pixels (217 ppi pixel density). To be quite honest the difference is hardly significant, the Lumia 820 has a high brightness function and is said to be more responsive to a super sensitive touch. In fact, unless you hold the screen real close to your face, or you spend time examining it with a magnifying glass, you’re not going to be able to tell that one has more pixels per inch than the other.
Storage: Both the Lumia 620 and the 820 have an internal memory of 8GB (7GB in SkyDrive) with an option to expand that for up to 64GB with a Micro SDXC card.
Camera: The camera functionalities between the two handsets are fairly significant. The 620 features a 5.0 megapixel camera with LED flash, 2.4 aperture with a resolution of 2592×1936 pixels. The 820 features an 8.0 megapixel camera with short pulse high power dual LED flash, 2.2 aperture, along with the Carl Zeiss Tessar lens which is a huge deciding factor here. The 820 wins hands down when it comes to camera quality, the difference in camera quality really does have an overall effect on the price difference between these two handsets.
Design: The Lumia 620 (115.4 x 61.1 x 11.0 mm; 127g) is a fair bit smaller than the 820, albeit slightly thicker. The Lumia 820 (123.8 mm x 68.5 mm x 9.9 mm) has that premium look about it and will give you a better quality of feel in the hand with it’s larger display and thinner appearance.
Conclusion: The main differences between the two are fairly obvious, the processor speeds being one of them, but for me it’s the camera on the Lumia 820; as this will be significantly better than the camera on the Lumia 620; especially with the added feature of the Carl Zeiss Tessar lens on the 820. Another factor to consider would be the difference in screen size. The Lumia 820 is a top mid-range device that offers some great features but the Lumia 620 priced at £189 ex VAT is an absolute steal in our eyes.