<p>I'm considering buying an M-series body with 22/f2 for street photography, and wondering whether how well my much-loved 380ex will work with it, or whether I should splash out on the 90ex that comes bundled with many M-series bodies. I don't use flash that frequently (and the 380ex works well on my old 30D when I do). Any comments based on first-hand experience and / or from Canon engineers especially welcome. :-)</p>