Features Key features of the Xperia J  vs GALAXY Ace 2 

screen size

Typing is easy on the Galaxy Ace 2, since your thumb can reach almost everywhere on the screen at that size, so you'll be able to quickly shoot text message replies without having to resort to the other hand for holding the phone.
GALAXY Ace 2 | by PhoneArena (Jul, 2012)

screen resolution

Xperia J
854 x 480
GALAXY Ace 2
800 x 480
Allowing for quicker access to key handset details and messaging alerts, the Android standard pull-down notification menu offers speedy shortcuts to the most vital data, helping to keep the Ace follow-on running along smoothly.
GALAXY Ace 2 | by TechRadar (Dec, 2012)

memory

Xperia J
0.5 GB
GALAXY Ace 2
0.75 GB

processor

Xperia J
Single core
GALAXY Ace 2
Dual core
We can't vouch for the final unit, but our prototype behaves very well in the interface, powered smoothly by the dual-core processor with ARM Mali-400 graphics unit.
GALAXY Ace 2 | by PhoneArena (Apr, 2012)

camera resolution

Samsung decided to keep the camera resolution on the new Galaxy Ace at 5MP, but they enabled 720p recording and added a front-facing camera.
GALAXY Ace 2 | by GSM Arena (Apr, 2012)

Differences What are the advantages of each

Front view of Sony Xperia J

Reasons to consider the
Sony Xperia J

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Faster processor 1 GHz vs 0.8 GHz Around 25% faster processor; run computation-intensive applications, such as photo editing, faster
More battery capacity 1,750 mA·h vs 1,500 mA·h More than 15% more battery capacity
Slightly bigger screen 4" vs 3.8" More than 5% bigger screen
Thinner 9.2 mm vs 10.5 mm More than 10% thinner
Side view of Samsung GALAXY Ace 2

Reasons to consider the
Samsung GALAXY Ace 2

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Supports NFC Yes vs No Somewhat common; Enables payment by phone and other wireless communications
More cores Dual core vs Single core Twice as many cores; each additional core lets your phone do more without visible UI slowdowns and jerkiness
Records higher def video 1280 x 720 @ 30 fps vs 640 x 480 @ Unknown 90x higher def video

Reviews Word on the street

Xperia J  vs GALAXY Ace 2 

5.0
6.5
The colors are vibrant, it is bright enough for use in sunlight, and sports very good viewing angles.
GALAXY Ace 2

6.0
7.0
Coming for a general all-round overhaul, the Galaxy Ace 2 has been bumped to an 800MHz dual-core processor from a similar speed single-core offering whilst the handset's RAM offering has made the jump from 278MB to a far more respectable 768MB.
GALAXY Ace 2

Overall

6.1 Out of 10
7.3 Out of 10

Specifications Full list of technical specs

screen

Xperia J  vs
GALAXY Ace 2 
Size 4" 3.8"
Resolution 854 x 480 800 x 480
Touchscreen Capacitive Capacitive
Multitouch Yes Yes
PPI 244 ppi 245 ppi

hardware

Clock speed 1 GHz 0.8 GHz
Number of cores Single core Dual core
RAM 0.5 GB 0.75 GB
Internal storage 4 GB 4 GB
Supported card formats
SDHC
SD

photo & video

Camera 5 MP 5 MP
Resolution 5 MP 5 MP
Flash Yes Yes
Secondary camera 0.3 MP 0.3 MP
Video resolution 640 x 480 @ Unknown 1280 x 720 @ 30 fps

cellular

Generation 3.5G 3.5G
Networks
GPRS (0.01 Mb/s)
HSUPA (5.76 Mb/s)
UMTS (0.38 Mb/s)
EDGE (0.38 Mb/s)
Unknown (7.2 Mb/s)
HSDPA (7.2 Mb/s)
GSM (0.01 Mb/s)

battery

Talk time (3G) 438 min 450 min
Standby time 36,432 min 40,176 min
Standby time (3G) 37,152 min 38,448 min
Capacity 1,750 mA·h 1,500 mA·h

form factor

Xperia J  vs
GALAXY Ace 2 
Weight 124 g 122 g
Thickness 9.2 mm 10.5 mm
Size 61.2 x 124.3 x 9.2 mm 62.2 x 118.3 x 10.5 mm

sensors

Has an assisted GPS Yes Yes

music

Supports FM radio Yes Yes

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 v2.1 Bluetooth v3.0
Sony Xperia J
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Samsung GALAXY Ace 2
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