I was using an a6600 (similar form factor) for a remote camera to be left out in the woods for months at a time. Just sold it recently. If it were full frame, I'd have probably kept it for the purpose. Sony's battery management software was better than Canon's in terms of its waking up/sleeping, etc. when dealing with external batteries. But it turns out the RP is even better at the battery stuff now, and is much cheaper than this new one.
I think this will sell well in the market for which it was intended (vloggers, street photographers and travelers), but is too late to be a secondary camera to a Canon system.
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