For perspective, at this writing there are six smartphones available with 6 GB of RAM (fully double this 3 GB prediction), and at least one more will ship before Apple ships its iPhone 7 models. The 6 GB RAM smartphones available today are:
vivo Xplay5 Elite
ZTE Axon 7
ZTE nubia Z11
Lenovo ZUK Z2 Pro
LeEco Le Max 2
OnePlus 3
The LG V20 and/or Asus Zenfone 3 Deluxe will likely ship before the iPhone 7. All of these devices have 5.5 inch screens, give or take. Yes, OK, Android generally requires more memory to accomplish substantially the same tasks. Nonetheless, Apple is not exactly wowing us. A bump to 4 GB of RAM across all iPhone 7 models would be somewhat more reasonable in 2016.