I’ll be honest, I was expecting this to be a “aha, I’ve discovered the G5 is significantly worse than the E-M5 piece”.
The summary is that it isn’t as good at high ISO, but that it is good enough for real world use for most purposes (and is certainly much better than cameras with the old panasonic 12mp sensor like the EP-3).
In all honesty, I was very impressed by the results from the G5 at 1600 ISO. Had I known they were going to be this good I probably would have pushed the camera up to 3200 ISO.
So everything is perfect, right? Well no, the camera is very good, but still struggles with DR in bright conditions and the controls and menus can be a bit inexplicable (nothing like as bad as a NEX camera). It is frustrating that there is no IBIS such that I’m limited to OIS lenses in conditions like tonight. Those are very small quibbles to me though.
Again, I would be happy to recommend the G5 as an excellent camera as an introduction to M43s. If you combine it with an excellent OIS lens like the 12-35mm it produces very nice results indeed.
Panasonic Lumix G5 and 12-35mm lens