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I haven't noticed it behaving any worse than other EVFs I've used. You're not stopping down your lens by any chance?
As I mentioned to Tariq, the VF2 is much brighter and detailed, in this lighting with no adjustment to settings on the M240. The image is slightly low res, but it is easy to focus on the composition. Yes, it does get worse when you stop down to f/4 to f/5.6. It is hard to set a lens on f/2.0, focus/compose, and then readjust the f stop to f/5.6 or 8.
I think the EVF is amazing when you inside, night time, or have no backlit situations though. I enjoy doing a lot of evening beach scenes, but I now just use the LV display set on bright sunlight, where the EVF is too dark.