None of the Android phones has ever really gotten the same cachet that the iPhone does (Samsung nearly got it right with the S3) but it's down to perception and marketing.
In terms of device capability Android phones are considerably higher spec and just as usable (5.x is a big improvement) but it doesn't really matter, fashion and marketing wins out.
You see this in other areas, Sennheiser headphones are demonstrably higher quality (in sound and construction) than "Beats by dre" but if the difference is small enough then fashion wins out again.