I think that Apple will have the advantage with their iOS system, along with their new Swift programming language in taking advantage of the 64 bit processors. When looking at the specs and the processor speed increase, that’s amazing by itself ... along with the increase in the RAM to 2 Megabytes.
Well, we’ll see. My Galaxy has 3 GB of RAM. Everybody will have 64 bit processors.
It’s entirely possible that Apple will have an insurmountable performance lead, but that would be due to software and developer tools (like Swift) rather than just a year’s lead in shifting to 64 bits... IMHO, of course.