I had a KIM-1 at the time and the Apple was lightyears ahead of it, even though they shared the same processor.
Most other 'personal computers' were still stuck in hexadecimal keyboard territory.
I've rolled my own (6800, '09 and 6502 based boards) and learned a lot doing that but the Apple I and later the Apple II (neither of which I ever owned but an uncle of mine had an Apple II that I played a lot with) was a real computer rather than something more akin to a large embedded system, programmed with paper tape and terminal interface using current loop. The Apple stuff rocked the world of personal computing.
The difference was huge, and I'm pretty sure that the design elements present in the Apple II raised the bar considerably for the competition and had a direct effect on the PC lineage.
It would be nice to interview the designers of the original IBM PC to ask them where they got their input.