I'm a bit confused. If you're trying to say that Huawei's P9 (released in 2016) took better pictures than Huawei's 6P (released in 2015) and than the iPhones, then I don't think there's anything to disagree over. They both took better pictures than the iPhones, seeing as they're both Huawei phones released shortly one after the other.

Now that I think about it, you might be saying that P9 was more wide-spread in the US than the 6P, which would also be confusing, because I don't think the P9 was officially sold in the US.