Panasonic's DMC-G7 is a mid-range mirrorless camera that supports 4K video, Wi-Fi, 16 MP sensor and a maximum ISO of 25,600. The EVF uses an XGA OLED microdisplay (interestingly Panasonic says it uses 'high-speed dual OLED displays, I'm not sure what they mean by dual displays).

Panasonic Lumix DMC-G7 photo

The DMC-7 will be available in June 2015 for $799.99 (with a 14-42 mm lens).

OLED type: 

XGA OLED Microdisplay

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Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters