using the standalone comparison tool. and comparing: Oly EM-5, Pana GX1 and Canon G1X, this is my opinion:at all ISO (200-6400)- at center: G1X is slightly better than EM-5 and EM-5 is significantly better than GX1- at corner: EM-5 is significantly better than GX1, and GX1 is slightly better G1X
EM-5 and GX1 were tested with the same 50mm lense. I would like to see the same test with the panasonic 14-42 lumix X pancake zoom, to get something that is more equivalent in price and compactness with the G1X lense! This is some work for DPreview :)Compare big 50mm prime lense with pancake zoom is not play!
Concerning the false "ISO" from Oly, if you set the sample for EM-5 to 3200 ISO and both G1X and GX1 to 1600, you don't get significant difference, EM-5 remain far better than GX1 (both at corner and at center), the GX1 remain the best at center, and the worse at corner.
"Disappointingly the lens has no filter thread of its own"Are you really sure? on the pictures, we can see some circles that strongly look like filter thread!!!imaging resource talk about it, but couldn't check the thread diameter.