I mean my partners new iphone has a phenomenal screen but not different enough to cover 600 quid difference in price phenomenal.

Go compare that Nokia to an iPhone 6S if you want an apples to apples comparison.

Be interesting to see a price comparison based upon total expected lifetime and usability of a product and by that, once support/updates and with that, security updates stop. That product is dead beyond some fanbase support. So for the base consumer market that's 99.9% of the end-users, this means there investment can last longer. Which is another factor in why the second hand price of Apple phones is much more stable and depreciate in value more gradually than Android alternatives.

THough there is also only so much tech you can cram into a phone and whilst the basic level of tech has risen and risen, it is worth noting that the mid-range android offerings are tech-wise, pretty darn good. Not saying we have reached peak tech or some form of leveling of, just yet. But the leaps - year upon year in the top end are smaller and smaller. Eventually we will get to the stage in which battery life becomes the factor again, after 2g phones leveled, that is what happened. Be case for smartphones and in some ranges, already starting to happen and an area of importance that will become more and more the main selling point in flagships, maybe not this year, but certainly soon.