If you need an amp to unleash means the output from the source sux.
For me even my computer setup i am using a XONAR D2X vs internal sound card and a XFI card before they all sound different.

I do not know how to explain maybe your professionalism is too high

But just for your experience sake go try plug one of this headphone on samsung galaxy S3 or Note 2 then plug back to your Lumia 920 and you will understand.

Since you are professional believe your ears not copy someone else review similar to my photography all the reviewers cant do what i do so why i wanna compare or listen to what they say?

Similar ppl tell me they need P&S or DSLR to set a different status vs my mobile photography?

I not very good in pin point to explain to you its like photography i see very unique angle that not many ppl can see similar to sound i been using lots of nokia phones all the audio quality is bad but at the beginning i just comfort myself aiya just listen then slowly your ears will get used to it but when you suddenly listen to something better you can immediately identify the difference

Not to forget MS was like that too, during the time when they dominated the PC OS market.

Few years ago Nokia was on top of the mobile industry.
Nokia owned 40% of the mobile OS market with symbian.
40%! What a scary number. Meaning every 10 phones sold in the market, Nokia made 4.
That time samsung was number 2, then samsung announced that they target themselve to become the biggest mobile phone manufacturer in 2 years.
Since that time samsung is not that famous in Malaysia, I laughed out hard, how possible that samsung can climb up and defeat Nokia?

So I was wrong. Look at Samsung today. They are everywhere.
These f**kers copied everything that they could, and they make a more powerful and cheaper one, because of their advanced technology in semi-conductor. And they go into every sector, look at wikipedia then you will know, they even make excavators.
Look at their galaxy series, don't tell me they didn't copy the design from iPhones. That's why I still hate samsung.
But nevertheless, it is still the most powerful mobile phone manufacturer today. 

Even though Nokia has felt hard, I don't see that it copied any design from others.
Their touchscreen phone, from 5800 to N8 to 808 to today fashion 920, they have their own design language. 
But Nokia hard to compete with samsung and apple in term of earning la, because unlike samsung and apple, they cannot build everything by their own, need to assign for other company to build for them, therefore the cost sure will shoot up high.
Samsung has its own factories, and Apple has so many cash that they can just buy the factory.
LOL talked too much.