It's actually smaller. It's bigger ONLY IF you compare H and W dimensions and completely forget about D.
If you look at the volumetric space of the 6 Plus it's 81,164 cubic mm. The Galaxy Note 4 volumetric is 102,553 cubic mm. So the Galaxy Note 4 is 26% bigger by volume. Weight between the two is comparable (172g vs. 176g), with the 6 Plus very slightly lighter.
So what you're saying is, the iPhone 6+ has a smaller D.