With dancing I can zone focus - the MFT multiple means greater depth of field to play with at any given aperture - so autofocus speed is far less of a concern.
I concur however that even the best MFT sensor isn't going to get close to a top-end DSLR, and especially the full frame ones. It's a trade-off I'm willing to make in order to achieve "camera in my coat pocket". The focus speed on a DSLR for me is around 7 hours as I'd have to drive home to get it first.
I'll have a 28mm equiv at around f2.5, which I'll use for street photography. For dancing I want to be further away; I don't want to get in the way, I'd prefer the dancers don't realise I'm there, and even with MFT I want some background bokeh.
In other news today, I found a new shop in Manchester selling nothing but Leica. I didn't dare go in
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