They will care once it's all that OEMs advertise, especially the battery life increase, higher 4G speed support, faster etc etc. A notable change that matters to more people is the camera ISP, which is a new generation ahead of SD821.
It's all about marketing, and you can bet that the likes of Samsung will be milking it in their marketing. It's the sole reason phones like the S6 and S7 have done so well. How are LG going to market the G6? It won't be offering any of the new advances in the hardware. It will be like what Sony have done to the Xperia Z line. Same old SoC in a new frock, and look where it got them!
It's harsh, but the only big players in phones these days for the Western world are Google, Samsung and Apple.