As you can see the GX7 comes up with a different result with the same focal length (approximately) and in the same light. The GX7 takes the picture at ISO 800 and is slightly overexposed compared to the others. This amounts to around 2/3 stop difference. This obviously 'skews' high ISO results.
Now you should be aware that some people think Fuji X cameras do the same thing, but from my experience they give me readings I would expect. There is also the issue that the above Sony shot was taken with the LA-EA4 adapter which simulates the effect of the fixed mirror on Sony's DSLT cameras. This is supposed to loose between 1/3 and 1/2 a stop. However, I've seen a recent article by someone who took the dramatic step of removing the mirror from his a99 and doing a before and after comparison. He found that there was in fact no loss of light at all. And certainly in the tests I performed I found the Sony and the Fuji were 'in agreement' on exposure the majority of the time, so that would seem to bear that out.
Contentious? maybe. But after years of taking pictures I can guess pretty accurately what an exposure should be and I'm always changing what my automatic metering gives me. In my film days I did use cameras without meters and I got an almost 100% success rate without ever using an external light meter. These days with my digital cameras I usually set my exposure manually unless I'm working quickly in mixed light. And in all the time I've used Panasonic cameras (and Olympus, they do it too) I've always had shutter speed / aperture / ISO readings that were somewhat better than they should be. I've just assumed that's the way it is and accepted it. I'm quite prepared to believe it's something to do with the processing and for the most part it doesn't really matter.
So having gone through all that and in the context of this comparison, I will again make the following assertion. If you are concerned about shooting at high ISO settings then the X-E2 will give you less noisy results. I would also point out that you will see this 'disparity' with all the following examples. So the ISO setting on the GX7 should be regarded with suspicion.
OK. I'll move on.
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