Features Key features of the Galaxy S II  vs Optimus F3 

screen size

Samsung has gone dual-core with the chipset now, upped the screen size to 4.3”, and slapped the newest 4.0 version of its TouchWiz Android skin.
Galaxy S II | by PhoneArena (Apr, 2011)

screen resolution

Galaxy S II
800 x 480
Optimus F3
800 x 480
Dynamic deepens the blacks for a visible contrast boost, casting away some detail in the process, while Movie mode brings a more toned down, cinematic atmosphere to the image.
Galaxy S II | by PhoneArena (May, 2011)

memory

processor

Galaxy S II
Dual core
Optimus F3
Dual core
The interface is flying - lag is barely there, only when you flip through homescreens loaded with widgets, and the dual-core 1.2GHz Samsung Exynos chipset carries its duties with pride.
Galaxy S II | by PhoneArena (May, 2011)

camera resolution

The indoor shots came out quite detailed as well, the 8MP sensor's low light sensitivity is good, while the LED flash does well, if you are fairly close to the subject.
Galaxy S II | by PhoneArena (Apr, 2011)

Differences What are the advantages of each

Default view of Samsung Galaxy S II

Reasons to consider the
Samsung Galaxy S II

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Screen uses OLED technology Yes vs No About half of smartphones are OLED; OLED screens are typically higher contrast and use less power
Supports FM radio Yes vs No Somewhat common; Listen to music and news from local radio stations
Store significantly more stuff 32 GB vs 4 GB 8x more storage capacity; free yourself from memory cards
Longer standby time 42,624 min vs 12,960 min More than 3.2x longer standby time
Higher resolution front camera 8 MP vs 5 MP 60% higher resolution front camera; Video chat with other people
Records higher def video 1920 x 1080 @ 30 fps vs 1920 x 1080 @ Unknown 30x higher def video
Bigger screen 4.3" vs 4" More than 5% bigger screen
Thinner 8.5 mm vs 10 mm More than 15% thinner
Front view of LG Optimus F3

Reasons to consider the
LG Optimus F3

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Supports NFC Yes vs No Somewhat common; Enables payment by phone and other wireless communications
Significantly more battery capacity 2,460 mA·h vs 1,650 mA·h Around 50% more battery capacity

Reviews Word on the street

Galaxy S II  vs Optimus F3 

8.8
6.5
Samsung is moving to a laser-based production method for its AMOLED displays this year, which will allow for Retina Display-like 300ppi+ pixel densities, so we are looking forward to such higher resolutions.
Galaxy S II

Specifications Full list of technical specs

screen

Galaxy S II  vs
Optimus F3 
Type AMOLED Super IPS LCD2
Size 4.3" 4"
Resolution 800 x 480 800 x 480
Touchscreen Capacitive Capacitive
Multitouch Yes Yes
PPI 216 ppi 233 ppi

sensors

Has an assisted GPS Yes Yes

music

Supports FM radio Yes No

software

Operating system Android 4.1.2 Android 4.1.2
Multitasking Yes Yes
App store Android Market Android Market
Adobe flash support No No
App store size 850,000 apps 850,000 apps

connectivity

Acts as a wi-fi hotspot Yes Yes
Supports NFC No Yes
Bluetooth Bluetooth v3.0 Bluetooth v4.0

form factor

Galaxy S II  vs
Optimus F3 
Weight 116 g 113 g
Thickness 8.5 mm 10 mm
Size 66.1 x 125.3 x 8.5 mm 62 x 116 x 10 mm

hardware

Clock speed 1.2 GHz 1.2 GHz
Number of cores Dual core Dual core
RAM 1 GB 1 GB
Internal storage 32 GB 4 GB
Supported card formats
SDHC
SD

photo & video

Camera 8 MP 5 MP
Resolution 8 MP 5 MP
Flash Yes Yes
Secondary camera 2 MP 0.3 MP
Video resolution 1920 x 1080 @ 30 fps 1920 x 1080 @ Unknown

cellular

Generation 4G 4G
Networks
LTE (20 Mb/s)
HSUPA (5.76 Mb/s)
UMTS (0.38 Mb/s)
HSPA (unspecified)
EDGE (0.38 Mb/s)
EV-DO Rev.A
Unknown (21.1 Mb/s)
CDMA (0.01 Mb/s)
HSDPA+ (21.1 Mb/s)
GSM (0.01 Mb/s)

battery

Talk time 1,098 min 960 min
Standby time 42,624 min 12,960 min
Capacity 1,650 mA·h 2,460 mA·h
Samsung Galaxy S II
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LG Optimus F3
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