Its a smartest note I have ever used.dont know about note 4. Bt deninitely best among all other note phones available in the market. RAM management is pretty good. But there not a great improvement in the camera from the previous note series. Processor is always good. So it is fast and smooth. And there are no lags seen till now. High graphic games working smoothly.
But the price is a bit on higher side. I u want to use phone for long time then go for it. It a durable product. If u change ur phone after few months then go for other cheaper alternatives.