Did an ISO test between the E-M5 and the old (but still great) 1Ds II. Can 8 years of technological advancement make up for 4x the sensor area? OM-D E-M5 vs a Full Frame Legend, Part 1 @ Admiring Light Answer? Very close, but not quite. Still, it's definitely close enough to not really matter in daily use, and is plenty good enough for my needs. I'm going to do a few more tests over the next week or two, which will be mostly real world. While the tests like I did for this are somewhat interesting, I'm much more interested in how the cameras perform in real life.