Journalists at The Mac Observer compared the performance of four devices such as Google Nexus 7, New ipad, Kindle Fire and Microsoft Surface . Then they made a visual comparison table with accurate specs available of table, you can look at it below. Journalists noted that Google Nexus 7 may affect future sales of iPad, but is unlikely to take the tablet market share from Apple. It is worth noting that both devices are in different price categories. The greatest damage will be inflicted on other tablets like Kindle fire and other tablets which are in same price range.
The Mac Observer journalists believe that the greatest impact will be caused to Kindle Fire and Barnes & Noble Nook Color, but the last device in the comparison is not taken into account. The last Tablet Surface from Microsoft is unlikely to be affected, it’s a totally different price class, as well as the iPad. Therefore, the greatest damage will be a 7-inch tablet from Amazon and Barnes & Noble, that is, Kindle Fire and Nook Color. We want to remind you that according to recent rumors Kindle Fire 2 will be released in late July and the price of first-generation Kindle Fire will fall to $ 149.

Google Nexus 7 Vs New ipad Vs Amazon Kindle Fire Vs Microsoft Surface comparison table :
Product Google Nexus 7 The New ipad Amazon Kindle Fire Microsoft Surface for Windows RT
Os Android 4.1 Jelly Bean iOS 5.1 Android 2.3 (forked version) Windows RT
Dimensions 7.81 x 4.72 x 0.41
(198.5 x 120 x 10.45 mm)9.5 x 7.31 x 0.37 7.5x4.7 x 0.45 ? x ? x 0.37 (9.3mm)
Weight 0.75 (340 grams) 1.4 (Wi-Fi) 1.46 (4G) LBS 0.91 1.49
Display Size 7 9.7 7 10.6
Screen resolution 1280 x 800 2048 x 1536 (LED Backlit IPS Display) 1024 x 600 ClearType HD Display
May be 1280 x 720
Pixel per inch (PPI) 220 264 169 Unknown
RAM 1GB 1GB 512 Unknown
Processor Nvidia 1.3 GHz Tegra 3 Quad- core CPU A5X (dual core) 1 GHz; quad core GPU TI OMAP dual core/ 1 GHz Unspecified Nvidia ARM-Based Tegra Processor
User Memory (GB) 8/16 16/32/64 8 32/64
Expanded Memory No No Unknown - microSD
cloud Storage Google Cloud iCIoud Free Cloud Storage for Amazon Content Microsoft SkyDrive - May be
Front Camera 1.2 MP VGA No possible
Rear camera X 5 MP (1080p) stabilization No Yes (resolution unknown)
Camera Flash X No No Yes (resolution unknown)
Microphone Yes Yes No Unknown
Audio/Speakers stereo spkrs & headphone mono spkr, stereo headphone mono spkr, stereo headphones Yes/Unknown
Wi-Fi 802.11 b/g/n 802.11 a/b/g/n 802.11 b/g/n 802.11 b/g/n
Network (GSM) X UMTS/HSPA/HSPA+/ DC-HSDPA/4G-LTE No Unknown
Network (CDMA) X CDMA, EV-DO/UMTS/ No Unknown
Bluetooth Yes (unspecified) 4.0 No Unknown/Bluetooth 4.0 probably
GPS Yes w/4G No Unknown/ probably yes
Battery Life/Capacity 8 / (4325 mAh) 10 (11666 mAh) 8 (4400 mAh) Unspecified (31.5 watt-hr)
Accelerometer Yes Yes No Unknown
Magnetometer/ Compass Yes Yes No Unknown
Gyroscope/G-Sensor Yes Yes No Unknown
Video Out No HDMI (w/ accessory) + AirPlay No Micro HD Video
USB USB 2.0 No Yes USB 2.0
Sensors Ambient Light, Proximity Ambient Light No Unknown
Colors Black Black or White Black Gray (with variety of colored keyboards)
Price US $ (Wi-Fi) 199/249 499/599/699 199 Unknown (probably $399 and up)
Price US $ (3G/4G) N/A 629/729/829 N/A Unknown (probably $499)