I have Samsung Notes 8. The 8 MP camera is decent. Unlike Samsung Galaxy S4, it still has macro mode, so it could take watch picture well without having to play with zoom.
The weakness of Samsung tablet and smartphone camera is in low light condition.
In bright and sunlight condition Samsung camera is similar or slightly better than Iphone due to its higher megapixel. However if you plan to take the picture indoor with room light or limited focused light, then Samsung picture quality is inferior. Its autofocus will have difficult times to find the sweetspot of the object. I haven't find the way to have right setting in low light condition.
Iphone camera is far superior in low light condition due to its bigger size CCD sensor, eventhough the resolution is half of Samsung S4.
Just my 2 cents.