Well, im glad you like your galaxy sII! I love my iPhone 4s! I can't stand droid software, i dont want anything windows related anymore. I prefer apples software because it is safe and difficult to hack. The SII is lightweight plastic, Yuk! I prefer the robust feel and weight of the iPhone 4s's glass and stainless. So if apple chooses to put a amoled screen in the iPhone, it had better be calibrated for photographers like myself to display my work. The SII was too contrasty and the color balance was off and it would not work for me. You may not notice any color balance variances, but to a trained eye, I can. I guess you left apple for the larger screen? It's not that much larger, besides you be used to it in a month and it wont appear as large as it did when you first saw it and you'll probably want to go bigger still. If you left the iPhone for that reason, that is.
I actually know an photographer who uses his SGII as well, there's an app called screen adjuster where you can play with the settings to get saturation/contrast etc to how you like, and the developer is making a few other adjustments for it to use. It's what I used to adjust to how I want it. He Rarely uses the phone anyway for photography as he has $$ equipment to use, usually used to show quick pics to clients or examples. But if that means more to you then anything then the iPhone is fine as it has the edge there, not everyone is a professional photographer though. It takes way better pics then the 4, and with my current settings it's fairly close to a 4S, the 4S seems a bit warmer and focused in certain areas vs the SGII having more pop.
Left the iPhone, b/c mainly there's no Jailbreak for the 4S and may not be for long time since their having trouble with the cracking the new system reliably (and I will not use an iPhone without the custom tweaks I use currently like SBS nor be restricted by Apples dumb folder system that limits you and can't have folders in a folder, and it still irks me that Apple still hasn't put a good text editor in if you make a mistake or even just want to add something in... I type a ton of emails and text for business and it's annoying not being able to go to exactly where I want to edit w/o having to delete or retype the word b/c it didn't even get the right spot, plenty on here have mentioned that annoying issue, the one in Android is so much better and lets you accurate pinpoint any word or letter fast).
I don't want 4.5"+ screens, a lot of those phones are bulkier and some are awkward shaped like I hate the camera bump on some (the SGII is flush) etc. Samsung nailed it with the 4.3" for the i777 version as they made an excellent screen in that size in a phone that's barely bigger then an iPhone. It may not be that much larger, but it's a lot better in normal use with the larger screen real estate... I mean I can kick back at night and not have the phone close to my face in bed and read and browse easier (and I have excellent vision at 20/15). I still have my iPhones, I just decided to go Droid this time, and it's great setting the phone up to exactly how I want. Same reason I jailbreak'd my iPhone. My gf even likes using it more then the 4 which I got for her and she's not much of a phone person, I refuse to use her crackberry for work lol.
Don't mind the light feel of the SGII, I actually like it. I do like the aluminum feel of the iPhone 4 more, but that's it's downfall, makes it so fragile. Then if you have it in a case, well so much for "feeling" and showing off that aluminum build lol.
Like I said I still kept my iPhones so it's not like I left Apple, just hope they do something very new and cool for next year. Right now I'm really impressed with this phone, absolutely no lag or anything, just as smooth and fast as iOS.
4S is a great phone, just wasn't for me. Plus I got it for less than $1 and not even any sales tax as an upgrade when Sams Club did their Black Friday sale, no way could I pass up that insane deal. Both phones kick ass, so can't go wrong either way... just for what I want to do I preferred the SGII.
For me the display is extremely important. I hope LG will produce better displays than Samsung since I am sure Apple (will not use/will not be able to use) Samsung displays from now on. That said: I think the SG2 display is better than the retina on 4/4s despite the lower resolution. Otoh, Samsung TV's are crap imo. I cried bitter tears when Pioneer sold their TV division.
Samsung tv's are actually highly regarded throughout the industry, they do pretty much everything in house. I have an business acquaintance that works in the flat panel industry (they provide Samsung materials for one of their plants). If you had a bad experience with them, doesn't mean their crap (like saying you had a bad experience with Honda therefore Hondas are crap).
They actually makes parts for most other companies to use in their tv's from panels to the electronics. Majority of Sony's panels even their $$ XBR line is from Samsung. LG a few years ago even made a few of the panels for some of Samsung's tv's. But in general, Samsung is the key player for others in the tv industry. We had a Pioneer Kuro, even today considered the epitome of plasma's, had plenty of issues with that tv. Do I think Pioneer sucks, no way, just luck of the draw, no company will have 100% perfect products.