Recently I had a chance to spend a large amount of time with two of the most interesting mirrorless cameras currently on the market: Fujifilm X-Pro 1 and Sony NEX-7. I am also a happy owner of the Panasonic GH2 and have extensive experience shooting with various Olympus Micro 4/3 cameras using the VF-2 add-on viewfinder. That's why I wanted to make a comparison of the viewfinders used in those cameras because for me this is one of the most important features in any camera. To some extent, this comparison is also applicable to the Olympus OM-D E-M5 (which uses the same EVF module as the VF-2), Panasonic LVF-2 (which has almost the same EVF as the Panasonic GH2), Sony Alpha A77, A65 and NEX-5N with the FDA-EV1s (those cameras feature the same EVF as the NEX-7). 1. Fujifilm X-Pro 1. The hybrid viewfinder of the X-Pro 1 is excellent. In the optical mode, it obviously doesn't have any delay and is as bright and clear as any other optical viewfinder out there, but with useful electronic overlays including virtual bubble level, histogram, and parallax-corrected AF point indication. Simply stunning. In the electronic mode, the X-Pro 1's EVF has a very good resolution of 1.44M dots and features relatively good dynamic range. The biggest downside of the EVF in the X-Pro 1 is its slow refresh rate and noticeable delay, especially in low light. It also has no diopter correction whatsoever. The size of the EVF is relatively small - it looks almost the same as Olympus VF-2, maybe slightly bigger. 2. Sony NEX-7. The NEX-7's EVF has the highest resolution (2.35M dots). It's also one of the biggest — approximately on par with the EVF in the Panasonic GH2. However, in many ways it's inferior to every other EVF in this comparison. Its dynamic range is very narrow and it crushes shadow areas completely. Surprisingly, it's also the noisiest in low light situations. And its eye-relief is very tight; I wear glasses and I'm not able to see the whole frame at once when shooting with the NEX-7. It has one redeeming quality, however — it has a relatively deep eyecup which is more effective at blocking stray light than others. 3. Panasonic GH2. Panasonic was the first camera company to offer truly excellent EVFs. The EVF in the GH2 is very large and bright. It also has a very good resolution of approx. 1.44M dots. Unlike other Panasonic cameras, the EVF in the GH2 is multi-aspect to match its unique sensor. It also provides generous eye-relief — I have never had any problems with glasses. Its dynamic range is somewhere between the Sony NEX-7 and the Fujifilm X-Pro 1. 4. Olympus VF-2. This EVF is superb. It's not as big as the Panasonic one, but it's very crisp and clear, with excellent dynamic range (although still much worse than an OVF) and color rendition. Its eye-relief is also quite good. I know that such things are a matter of personal preferences, but I think Olympus VF-2 is simply the best of the bunch. The Panasonic GH2 EVF is a close second, and the EVF of the Sony NEX-7 is a distant third. As for the X-Pro 1, its viewfinder is unique. As a whole it's super awesome, but its EVF part is no fun because of slow refresh rate and noticeable delay. Hope that simple comparison is useful for you!