Let's compare apples with apples, shall we? Let's compare the S4 to the 5S in, say, Germany, France or the UK.
But I'm guessing this is pointless - you live in a country where iOS is largely meaningless, so you're trying to somehow bend the numbers so they fit you personally. I can't blame you for doing that, but at this point, I've decided that I won't carry this discussion any further.
Also in Italy there isn't a single model which sells more than iPhone ....
You are speaking about a market you clearly don't know ....
Again you are playing the game "iPhone vs a crowd of crappy cheap Android AND WP8 phones" ...
Do you want to compare iPhone 5s vs Lumia 920 sales in Italy ?
Be my guest ....
----------
Who's talking about benchmarks? I said that in a side by side test of the same web page loaded on both devices the S4 scrolls faster.
Benchmarks are far more reliable than a subjective test ....