Man, i didn't!
21 was surprisingly comfortable like duck to water. 35 wasn't a pain to get used to but i had to be 'more careful' for some reason.
What i observed was that i wAs drawn to doing portraits with the 35 and 'street' with the 21 especially in close quarters. I used the 35 on a busy market day and struggled.
The 35 is still the best all arounder for me as it can do stills to landscape to people. But the 21... Hand to hand combat