Windows OS 8, is something which has been in news for a while now. Leaving Tablets, PCs & Notebooks aside, Windows 8 is now also running Smartphones. Almost every major mobile manufacturer is offering a Windows Phone 8. If you are also thinking to buy a Windows 8 running Smartphone, we are bringing you a very sizzling hot knockout comparison between upcoming Nokia Lumia 620, the stylish HTC Windows Phone 8S and Samsung’s ATIV S.Introduction:Nokia Lumia 620 is a much awaited Windows 8 Phone now, and is expected to launch in mid of January 2013. It boasts stylish looks and its colours make it the most vibrant Lumia in the Nokia Family.HTC’s Windows Phone 8 S, is a very vibrant coloured and very intellectual smartphone carrying some great specifications and features around. You would hardly miss anything in this Smartphone.The Third Phone comes from the South Korean manufacturer, Samsung. This Smartphone, Samsung ATIV S boasts great innovative technology which make it a futuristic device. It sports a very brilliant Screen, which makes it a perfect buy.Display:Nokia Lumia 620 Sports a 3.8 inch, 800 x 480p Capacitive multipoint touch screen. Its display features Polarization filter, Light time-out, Ambient light detector, Brightness control, Orientation sensor and many more. HTC Windows Phone 8 S sports a 4 inches WVGA Super LCD touchscreen with Corning Gorilla Glass. It also features Proximity sensors and Ambient light sensors. Samsung ATIV S has a brilliant and a better of all display as it sports 4.8 inches, 720 x 1280 px Super AMOLED Capacitive Touchscreen, 16M Colors with Corning Gorilla Glass 2. Its display features Accelerometer, Gyro, Proximity & Light Sensors.Processor:Nokia Lumia 620 is powered by a Dual Core 1GHz, Chipset : Qualcomm Snapdragon S4 Processor with 512 MB RAM. HTC Windows Phone 8 S is powered by 1GHz Krait Dual-core Qualcomm Snapdragon S4 Processor, Adreno 225 GPU coupled with 512 MB RAM. Samsung ATIV S is also powered by Dual-core Krait 1.5 GHz, Chipset : Qualcomm Snapdragon S4, GPU : Adreno 225 with 1 GB RAM. The Processor of all these three devices are almost same but Samsung ATIV S Packs 1GB of RAM, whereas HTC 8 S and Nokia Lumia 620 boasts only 512 MB RAM.Camera:Nokia Lumia 620 packs a 5.0 MP Rear Camera (2592×1944 Pixels) with Auto Focus and LED Flash and also carries a Front VGA Camera (640×480 Pixels) for video calls. HTC Windows Phone 8 S packs a 5.0 Mega Pixels Rear Camera with Auto Focus and LED Flash which is capable of making 720p Videos @ 30fps. Samsung ATIV S is a leader in this category as it Packs 8.0 MP Camera (3264×2448 Pixels) with Auto-Focus and LED Flash, and a Front Camera of 1.9 MP for Video Calls.Memory:Nokia Lumia 620 has 8GB of inbuilt storage, which can be expanded up to 64GB using a microSD card. HTC Windows Phone 8 S has 4GB of internal storage, which is expandable up to 32GB using a microSD card. Samsung ATIV S comes in two options with inbuilt storage of 16GB or 32GB, which can be expanded upto 32GB using a microSD card.Connectivity:Nokia Lumia 620 connectivity features include 3G, Bluetooth v3.0 with A2DP, EDR, Wi-fi, GPS with A-GPS support and GLONASS. HTC Windows Phone 8 S connectivity option include 3G, Bluetooth v2.1 with A2DP, EDR, Wi-fi, Micro USB 2.0, GPS with A-GPS support and GLONASS. Samsung ATIV S Connectivity options include 3G, Wi-fi, Bluetooth 3.0 with A2DP, GPS with A-GPS, GLONASS & microUSB 2.0. On Connectivity front, all the 3 Smartphones offer almost same options.Features:Nokia Lumia 620 features Accelerometer, Proximity, Compass, Light Sensor and its camera features Geo-tagging, Face detection, White balance presets, Scenes, Touch focus and this device also packs many other features. HTC 8 S features G-Sensor, Proximity Sensor, Ambient Light Sensor, its display features Touch-Sensitive Controls, Multi-Touch Screen, Corning Gorilla Glass and has a fine camera with F2.8 aperture and 35mm lens, Geo-tagging, Touch focus, Face detection. Samsung ATIV S Packs features like Accelerometer, Gyro, Proximity, Compass, Light Sensor. And its camera features Geo-tagging & Image stabilization. It supports all major Audio & Video formats. This Phone comes with many Pre-installed Apps. All these three devices boasts some what equal features.Verdict:All these 3 Smartphones are worth a buy. One will be completely in great confusion to opt which one of these. HTC Windows Phone 8 S packs some great features and is really appreciated worldwide for its features. However, Nokia Lumia 620 and Samsung ATIV S boasts some additional specifications like a front camera. It would be interesting to see at what price Nokia launches the Lumia 620 as its low price tag will surely make it a worth buy over Samsung ATIV S. The Samsung fans will anyway go with its power packed ATIV S.