The one who is using iphone can know much abou the major difference and knows well to where to invest money and in which model as I m using iphone 7 matteblack 64gb.
Thei phone 8 which is launched by the apple is worth to invest in it as, if guy want to buy iphone so he must not go thrugh iphone 8 as he can buy iphone 7 as there not having valueable difference. As iphone 7 is having 2gb ram 12mp camera same processor as tgere is only a slight change between both of the model, so it doesnt mean to invest 20000 more on iphone 8 as it will going to be no use.
All tge specification provided by iphone 7 is upto same as iphobe 8 , so its of no use to buy iphone 8 its worth for having value of money