Out of curiosity: For those of you that do not like the 20 gram increase of the iPhone 6s compared to last year's iPhone 6, Do you currently have a case on your phone? If you're getting an 6s/Plus, do you plan on getting a case for it?
While the majority of iPhones I see out in public have cases on them, I won't dispute the fact that there are people who prefer having a naked phone.
Some of the more common and/or "lightweight" cases for the iPhone 6:
iPhone 6 Silicone case: 17 grams
Incipio feather for iPhone 6: 0.7oz = 19.8 grams
Griffin Reveal for iPhone 6: 1.2oz = 34 grams
Otterbox Defender for iPhone 6: 70 grams
Mophie Juice Pack Air for iPhone 6: 3.5oz = 99.22 grams
Also, for comparison: A single US nickel is 5 grams.
My 6+ feels noticeably heavier with a case on. I enjoy the weight of the phone when I take it out to clean it. So with the 6S+ it will be like putting two Incipio cases on instead of one...