So I have quite a bit of :43: gear as you can see in my signature below. I am thinking about selling my GX1 and LX7 to help fund the purchase of a new GM1. But Adorama is currently discounting the Ricoh GR to just under $700. So, I'm wondering if one gathers more light with a four-thirds sensor and a lens like, say, the Panny 20mm f/1.7 or with the Ricoh's APS-C sensor and 28mm f/2.8 lens? Of course, I'd have all those other :43: lenses to use on the GM1 if I desired.