Here we have made comprehensive comparison of the smartphone released in last few month, but we are not giving any verdict on them though it is pretty clear. It is on you all to judge it by yourself. Do let us know what are your opinions.
     

	Appple iPhone 5	SAMSUNG GALAXY S III	Nokia Lumia 920
OS	Apple iOS 6	Android 4.0.4 Ice Cream Sandwich (upgradable to 4.1 Jelly Bean)	Windows Phone 8
Display	4-inch LED-backlit IPS TFT	4.8-inch HD Super AMOLED w/ Corning Gorilla Glass 2	4.5-inch PureMotion HD+ w/ Corning Gorilla Glass
Pixel density	~326 ppi pixel density	~306 ppi pixel density	~332 ppi pixel density
Resolution	1136 x 640	HD (1280 x 720)	HD (1280 x 768)
Height Width Thickness	123.8 mm 58.5 mm 7.6 mm	136.6mm 70.6mm 8.6mm	130.3 mm 70.8 mm 10.7 mm
Weight	112 grams	133 grams	185 grams
Processor	Apple A6	1.4GHz quad-core Cortex A9 processor Exynos 4212 Quad	1.5GHz dual-core Krait processor Qualcomm MSM8960 Snapdragon
GPU	-	Mali-400MP	Adreno 225
RAM	TBA	1GB	1GB
Storage	16GB / 32GB / 64GB	16GB / 32GB / 64GB	32GB
microSD card slot	No	Yes, up to 64GB	No
Primary camera	8 MP, 3264×2448 pixels, autofocus	8 MP, 3264×2448 pixels, autofocus	8 MP, 3264×2448 pixels, autofocus
Primary camera extras	Touch focus, geo-tagging, face detection, panorama, HDR	Simultaneous HD video and image recording, geo-tagging, touch focus, face and smile detection, image stabilization	Carl Zeiss optics, optical image stabilization, autofocus, dual-LED flash, PureView technology, geo-tagging
Front camera	720p	1.9MP 720p@30fps	1.3MP 720p@30fps
Battery	-	Li-Ion 2100 mAh	Li-Ion 2000 mAh
Wi-Fi	Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Plus Cellular	Wi-Fi 802.11 a/b/g/n, DLNA, Wi-Fi Direct, Wi-Fi hotspot	802.11 a/b/g/n, DLNA, Wi-Fi Direct, Wi-Fi hotspot
Network	2G Network GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900 – for Verizon 3G Network HSDPA 850 / 900 / 1900 / 2100 CDMA2000 1xEV-DO – for Verizon 4G Network LTE 700 MHz Class 17 / 2100 – for AT&T LTE 700 MHz Class 13 – for Verizon	2G Network GSM 850 / 900 / 1800 / 1900 3G Network HSDPA 850 / 900 / 1900 / 2100 4G Network LTE (regional)	2G Network GSM 850 / 900 / 1800 / 1900 3G Network HSDPA 850 / 900 / 1900 / 2100 4G Network LTE 800 / 1800 / 2600 / 900 / 2100
USB	Yes, proprietary 9-pin connector	Yes, microUSB v2.0 (MHL), USB On-the-go	Yes, microUSB (MHL) v2.0
Bluetooth	Yes, v4.0 with A2DP, EDR	Yes, v4.0 with A2DP, EDR	Yes, v3.1 with A2DP, EDR
NFC	No	Yes	Yes
Sensors	Gyroscope, G-Sensor, Digital Compass, Ambient Light Sensor, Proximity Sensor	Gyroscope, Accelerometer, Digital Compass, Ambient Light Sensor, Proximity Sensor	Gyroscope, G-Sensor, Digital Compass, Ambient Light Sensor, Proximity Sensor, Barometer
Availability	September 21	Currently available	Expected release 2012, Q4

Article Source: http://blog.gsmarena.com

We have already posted some of the important information related to iPhone 5 earlier. These posts will helps you to decide which way to go and what you should be expecting.
 
In the articles below you can find the comparison videos of the rumored design of the upcoming 'iPhone 5' to the Samsung Galaxy S3. So if you have still not decides which phone to buy you might be able to makeup your mind from here.

Here you can find the comparison of the rumored design of the upcoming 'iPhone 5' to the Samsung Galaxy S3. So if you have still not decides which phone to buy you might be able to makeup a mind from here.

As it happened, there was no iPhone 5 after all, but the company did announce the iPhone 4S. However, the iPhone 5 is still on the cards - we're expecting it to debut in mid-2012.

iPhone 5 release date
Given the pattern of Apple's iPhone launches, we're expecting the next-gen iPhone 5 to debut in mid to late 2012. We reckon it's most likely to be shown off at Apple's Worldwide Developer Event (WWDC), which usually takes place in early June.Rumours that we reported on 18 October claim an iPhone 5 release date of Summer 2012. Analyst Ashok Kumar claimed that the absent iPhone 5 was meant to be the big announcement at the recent event where the iPhone 4S was launched.