I've occasionally tried the 40mm pancake on my full frame bodies (5D Mark III and 6D), hoping to have an alternative to buying a small more portable camera. The size wasn't bad, but unfortunately, at least for me, the 40mm has usually been too narrow even on a full frame body (The most recent situations that were a problem were family get-togethers, indoors.). I think I'd generally do better with something in the 24mm range, if that were available in a pancake for the full frame. So, though not very portable, I take my 24-70 for general wanderings.
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