Absolutely, but when it comes to the iPhone 6 vs 6 Plus, it's a pretty darn fair to compare, all things considered - when it comes to JUST resolution.
I had both. I was exposed to both. They were very, very similar but certainly not the same. Don't have a dog in this fight, just think these discussions could be more substantive. Look at the iPad mini as an exemplar of significant upgrades to the details not being a greater point of emphasis to avg consumer.
And we will almost certainly find that the new cameras will be substantially better. There are some serious sensor advances at work in there, though with other trade offs. And the battery to accommodate the Taptic Engine. Etc etc