The phones did not have powerful CPUs in the first place, so even modest improvements would actually result in the user noticing dramatic improvements in their usage. AND ... Apple had actually demonstrated this improvement through gaming programs and photo apps that modified users’ photos.
Perhaps it’s program dependent.
I’ve read a number of articles that put the advantage Windows 64 bit had over 32 bit in the 10 to 20% range for speed, but there were some programs that had very high memory transfer requirements which were at the upper end of that range.
I’m not like those guys who pooh-poohed 32 bit systems back in the day when AMD has extra-fast 80286 CPUs. I just don’t think that the one-year headstart will make much difference except for certain programs for most users. In a year, both camps (and Windows, too) will all be 64 bit on phones.