Looks to be the same as the add-on viewfinder but smaller than the GH2. For some perspective, a .50 would be half the size you see with your naked eye, so the bigger, the better. These are crop factor corrected: Canon EOS-1D X .76 Sony NEX-7 .73 Nikon D700 .72 LEICA M7 .72 Panasonic GH2 .71 Canon EOS 5D Mark III .71 Nikon D4 .70 Nikon D7000 .63 Canon EOS 7D .62 Pentax K-1 .61 Canon EOS 60D .59 Olympus OM-D E-M5 .58 Olympus E-5 .58 Nikon D3000 .53 Nikon D5100 .52 Fuji X-Pro1 .40 from dpreview: "One figure hidden away in every SLR's spec is the size of the viewfinder (often in a format that makes comparison between competing models impossible). The size of the viewfinder is a key factor in the usability of an SLR - the bigger it is, the easier it is to frame and focus your shots, and the more enjoyable and involving process it is. Because of the way viewfinders are measured (using a fixed lens, rather than a lens of equivalent magnification), you also need to take the sensor size into account, so the numbers in the diagram below are the manufacturer's specified magnifications divided by the respective 'crop factors'." The E-M5 is about the same as the 60D below: Wish I could look through one, afraid it may be a step backward from the GH2. Any concerns are are you just happy it has one?