80% or 71% doesn't matter.... but if it is 50% to 20% at 5pm... that is a problem.. Jury is still out
When you have iPhones running just basic and minimal stuff in the background and not even doing real multitasking, then you get a device that is running by default dozens of apps and services from Google, Samsung and even Carriers, you can't really do an apples to apples comparison.
On Android you should be willing to do some tweaks not needed on iPhones because they are not there. You have just 2 options, leave everything on, as it comes by default and suffer from the expected battery drains or do some tweaks removing bloatware, turning off, disable or uninstall unnecessary services and apps and be aware of the critical change on the Location History settings that affects all the devices running latest Google Play services. This Location reporting is a huge battery drain on Android, not on iPhones, if you get what I mean.
Like I've said dozens of times already, doing the above is not crippling your device, is simply doing the fine tuning that neither Google or Samsung (or any other Android OEM) are doing. Having everything on all the time is and will never be the optimal and smarter thing to do, not even on a 4000mAh battery device. Doing this tweaks will just make your device as fine tuned as an iPhone that everybody seem to have some high praise for it.
For better standby time try what I have posted in the past days, look for the Auto Stop features if available on your device and download Doze app from the Play Store, it will help until Android M is released with its integrated Doze feature.