Looking through some test shots, I see the Fuji RAF files tend to be around 25MB for ISO 200 and OMD ORF files tend to be around 15MB. This doesn't make any sense, because they are both about 16MP. Also, the Fuji generally is a little less noisy. Are ORF files compressed RAW (hopefully loss-less??) and Fuji un- or less-compressed? Is Fuji more bits? Anyone know the answer?