What we can say, without too much fear of contradiction , is that all the sets being judged do certain things differently. We can also say that no one set seems to do EVERYTHING better than the others and so it ultimately boils down to what is most important to you, the individual.
Buy an A1 and you have to accept some compromises as compared to a C7. Likewise buy a C7 and you must accept compromises as compared to the A!.
For me , personally, I found the decision fairly easy because I wanted an OLED and not only did I prefer the overall picture performance of the C7, and it's styling, but it was £1,200 less expensive than the A!.(I did think some of that was possibly due to the audio screen of the A1 which I don't need.)
Others will have different priorities and views and will go for the A1. Horses for courses , as they say.