Hi there,
I'm in Year 13 so I haven't gotten into Kings yet, but I do have a dental offer from Kings so I can give some advice!
I would say that for Kings your UCAT and predicted A level are really important, they are more academically demanding with A* A A so I guess that's the baseline and you have to assume your 'competition' is just as good and have amazing grades. That would be the important step to getting an interview as most schools don't look too deeply into personal statements.