If you think DxO are credible then I don't know what to tell you. Remember when they put the OP7 (I think it was this model) as their highest ranked smartphone camera even though it was below average? Yeah, anyone willing to throw them some money can get a good review.Actually most reviews say there are improvements. Or just look at DxO.
I'm not saying their aren't any improvements in the 12PM camera, but they are very very miniscule. And unoticeable to most people. That doesn't mean the camera isn't great however. But I think you are drinking the Kool aid a bit when it comes to the upgrades Apple says they implemented. The end user doesn't get as much of an upgrade as Apple are touting.