Samsung Galaxy S 2 posted a new milestone as it recorded sales of 5 million units in 85 days.

The slim beauty which is yet to arrive in U.S. was earlier reported to have reached sales of 3 million units in 55 days.

Boy Genius Report showcased pictures of the upcoming Samsung Galaxy S 2 on AT&T. Unlike the Samsung Galaxy S 2 currently listed on Samsung website the leaked photos shows a device with sliding QWERTY keypad.

While the Galaxy S 2 juggernaut continues to roll, there is a powerful phone in Motorola's camp which is due to arrive by July 31, which has the potential to stop Samsung smartphone's unabated march.

Motorola first unveiled the phone in June and unlike its upcoming LTE 4G-based elusive cousin Droid Bionic, Motorola has clearly stated the phone's specifications.

Motorola Photon 4G, is the name of the Android superphone which will be available on Sprint network. The phone has the wherewithal to counter Galaxy S 2's threat.

Here is a comparison between the top notch Android phones Samsung Galaxy S2 and Motorola Photon 4G:

Display:

Samsung Galaxy S 2 brings the goodness of Super AMOLED screen on a 4.3-inch display with 800x480 screen resolution while Motorola Photon features a 4.3-inch qHDdisplay with 960x540 screen resolution.

Dimensions:

Motorola Photon weighs 5.6 oz and is 0.5-inch thick which is bettered by Samsung Galaxy S 2 by a huge margin. Galaxy S 2 weighs a mere 4oz and is 0.33-inch thick, thus making it one of the thinnest smartphones.

Processor:

Samsung Galaxy S 2 is powered by a 1.2GHz dual-core Orion chipset which gives it more compute power compared to Motorola Photon which sports a NVIDIA Tegra 2 dual-core chipset.

Memory:

Photon offers 1GB RAM and 16GB internal memory. Galaxy S 2 also has 1GB RAM but comes in 16/32GB internal memory configurations.

Camera:

Galaxy S2 comes fitted with an 8MP rear-facing camera and a 2MP front-facing camera. Motorola Photon also has an 8MP rear-facing camera and front-facing VGA camera. However Galaxy S2 scores over Photon as it offers 1080p video capture capability while Photon has 720p video capture capacity.

OS:

Both Samsung Galaxy S2 and Motorola Photon run on Android 2.3 or Gingerbread juice. Both also offer their own customized UIs. Samsung has its TouchWhiz 4.0 UI running atop Gingerbread while Photon has Motoblur.

Battery:

Samsung Galaxy S2 has a Li-lon 1650 mAh battery while Photon sports a 1700 mAh Lithium battery. Photon also offers a spare battery with a battery charger as well.

The key distinguishing feature that Photon offers is its worldphone characterstic, as it is both 4G and 3G compatible and it can be used on CDMA and WiMAX networks in US and on GSM internationally. Photon also offers an HD Station which comes with a wireless remote and HDMI cable which transforms the phone into a large screen computer. Once docked Motorola's Webtop application fires up with instant access to Firefox browser. However it does not offer the laptop dock which comes with Motorola's Atrix model.

Samsung Galaxy S2 lacks a dock but offers a feature called All Share which allows the phone to link wirelessly with a TV, laptop or even audio system to play multimedia files directly from the phone. All Share synchronizes the phone with a compatible DLNA based product.

Motorola Photon brings the benefits of built-in active kickstand which is unique to Sprint. Just flipping the kickstand makes the phone to automatically switch into landscape mode.

For enterprise customers Photon offers 3G/4G Mobile Hotspot capability for up to eight Wi-Fi enabled devices, Corporate (MS Exchange ActiveSync) and personal (POP & IMAP) email access, Messaging - personal and business email, Google TalkTM instant message and text messaging.

Samsung Galaxy S 2 features Microsoft Exchange Active Sync, on device encryption, VPN and Cisco WebEx support for enterprise customers. It also offers voice-recognition feature which allows a user to execute key phone functions through voice commands.