Battery Backup - As promised by Apple that iPhone 6S will have more lasting battery but it does not. The battery lasts around 6-8 hours and you will have to carry a bulky power bank or keep charger with you whole day wherever you go.
No Fancy Features - Compared with other smartphones of this range they are offering various fancy features, iPhone does not. iPhone still has the same operating system.
Too Expensive - Apple has always been the gold of all the phones in the market. You can only showoff your iPhone to your friends and nothing at all.
No Multi Window - In today’s date we need to jump off from one application to another instantly but iPhone after paying 50K bucks does not offers even this much. Other smartphones in this range has a lot more offer along with multi window options.
No Good Camera Qualtiy - Samsung S5 does offers more better camera quality than iPhone 6S. As stated by Apple, it comes along with 4k resolution but Samsung provides more better quality. Image stabilisation is not facilitated by iPhone 6S.