Ok, just now when waiting for my wife to infront of the supermarket, I tested the phone for a while...
Overall: very fast. I never used Atrix and Optimus x2, but this is really very fast.
Homescreen scrolling - no lagging, very smooth.
Gallery scrolling - seems like the reading speed is very fast, the pictures loads very fast and scrolling is very the smooth.
Web brosing: by default browser - Page loads very fast. Just complain our Internet connection from our telco isnt fast enough.
When using stock browser to browse Lowyat Forum, will have a bit lagg espcecial when u reply using stock browser. I'm not sure why, last time when I use my Nexus One and Nexus S also like that, but problem was gone if use Opera Mobile.
Ok, the scrolling experience is fast, other than fast, very fast, very smooth, my language is limited myself to describe it better..
Camera:
Nokia N86 8mp camera 's colour is nicer than this.
My Google Nexus S colour also nicer than SGS II..
not sure why SGS II colour isn't very sharp..
maybe i was taking indoor and the light isn't bright enough
will test outdoor tomorrow morning..
* no video call in Google Talk as the OS version.. SGS2 only 2.3
Nexus S wins in this point, with 2.3.4 Google Talk can do Video calling

Video shooting:
is it 1080p by default? I didn't notice the setting since it's just a simple test. video shooting is very fast and very smooth..u can feel the HD feel.. when you pause the playback, the picture stillness very good.
I think SGS II Video shooting is the best one I've seem.. (i've not seem Atrix, sony ericson Arch, and LG Optimus 3d and x2)
User interface experience:
I still like my Nexus One and Nexus S..the pure google OS..with some customize launcher and widgets.. I love the way how my nexus S works with those widgets, and I love launcherpro 's twitter widgets and launcherpro's facebook widgets... from a Google Development phone user to SGS 2, guys, no offended, I just feel "what is this ?" ... maybe I still not used to it..hope later when I got time I can discover more and love it more.
Keyboard:
I haven't got time to test swype, but the default samsung keyboard is very good enough. the best keyboard i've use is HTC_IME keyboard. and the 2nd one I think is Samsung keyboard (I wont included swype here as I'm only refering to the normal keyboard here) Maybe it's because of the screen size is big enough so it's much easier for me to type on this keyboard compares to Nexus S..
Hand grabbing feeling:
the phone is very light, it's only 0.5KG with box. so the phone itself is really very light.
If you haven't touch Nexus S before, you'll probably doesn't used to this phone as it's too light and sometimes u might feel lose of security when u hold this phone.
The size is big, you might feel not very handy if you comes from Nexus One size phone.. I have 3 belt pouch for mobile phone, 2 cannot be used due to SGSII size..
The battery cover got very fragile feeling. I don't have much confident on it..but the front build of the phone is perfect.. I feel like purposely show off this phone in
Kopitiam, let those Apple folks guess what is this on my hand

Ok, I'm stopping here, will continue more with photos later tonight
This post has been edited by ccm: May 6 2011, 11:46 PM