iPhone 7 Plus Camera - Pictures are bad

I was also less than impressed when pinching to zoom in on photos taken on my 7 Plus. After thinking that it might just be me, and a bit of user error, I persevered. However, still not happy with the level of definition in my photos, tonight I Googled "iPhone 7 Plus photos poor image quality", and found my way to this thread. I read the suggestion that to switch the setting in "Photos & Camera" from "Optimize iPhone Storage" to "Download and Keep Originals" had resulted in an improvement. I was sceptical, but gave it a try. To my surprise, it actually seems to have worked for me, too. Now granted, this was not exactly laboratory conditions, but comparing a photo taken of the same scene immediately before and after changing that setting, there is a marked improvement in the definition. It's also worth noting that so far the improvement remains even with the setting switched back to "Optimize iPhone Storage". So it does appear that, at least in some cases, the issue being experienced is the result of a stupid software bug. From what I've read, it doesn't appear to resolve the issue for all, but I'd definitely recommend changing this setting, and taking a before and after photo, to see if it results in an improvement for you.