Ask HN: doesn't the iPhone already have bokeh?

I've seen Apple's sample images of the iPhone 7 Plus, taken with the (as yet unreleased) Portrait mode. The shots look great, to be sure. But they haven't shown any side-by-side shots to demonstrate how this setup differs from a photo taken on an iPhone 7 (not Plus).

Seeing as how current iPhones already have some measure of background blur, how are customers supposed to make an informed decision about how great the Plus's new cameras are? I'm sure it'll be better, but I imagine I'm not the only person wondering if it's worth $100+ and a huge pocket bulge to go for the bigger phone.