Karacho - I guess which phone are you using at the moment? I came from iPhone 4 w/ broken home button so overall its VERY fast. BUT, since iOS6 is supported w/ iPhone 4 as well I do not feel like much of a NEW phone for me. I was able to move all the app and everything over effortlessly. the larger 4" screen is okay.. lot of apps still dont have the 4" screen utilized yet so when you open them, its actually only using 3.5" of the screen space. This includes the photos you took w/ iPhone 5 as well because of the aspect ratio they could not fully use the 4".
other than apps and pages being able to load faster, I don't see too much difference. If you're using 4S i'd suggest wait.
The weight and thinness of it is cool. but then you worry about scratching up such pretty phone.
I am thinking to try the Nokia Lumia 920 tho.. But just not too sure how Window's 8 phone would do and its sorta a steep learning curve for many..
And Thanks Phukkette!!!!!!!