one gets better one gets worse
Are you guys death as I've found the 5 sound more than enough. Remember you are a long time death if you lose it.
Actually yes there is a big difference, unfortunately big loss in the volume output between 4 and 5 models.
It might be well enough when listened in a closed, quiet premises but in crowded areas you hear the outer noise. It also becomes worse if you are listening an audio book or something involving speech . Ironically apple put yellow and red bits in the volume bar like its dangerously loud.
I personally got my brand new 5s and jailbroke it.
I am looking for a solution in the jailbreak tweeks , there is few and as far as I know Volume Amplifier seems to be most favoite one but it didn't work for me on the headphones and managed to increase the speaker voice but distored after few bars.
You might want to take a look at this
http://www.engadget.com/2012/10/02/iphone-vs-rivals-audio-tests/